Metabolic diseases is defined by a constellation of interconnected physiological, biochemical, clinical, and metabolic factors that directly increases the risk of cardiovascular disease, type 2 diabetes mellitus, and all cause mortality. Associated conditions include hyperuricemia, fatty liver (especially in concurrent obesity) progressing to nonalcoholic fatty liver disease, polycystic ovarian syndrome (in women), erectile dysfunction (in men), and acanthosis nigricans. Metabolic disease modeling is an essential component of biomedical research and a mandatory prerequisite for the treatment of human disease. Somatic genome editing using CRISPR/Cas9 might be used to establish novel metabolic disease models.


Anti-infection >
Arenavirus Bacterial CMV Enterovirus Filovirus Fungal HBV HCV HIV HSV Influenza Virus Parasite Reverse Transcriptase RSV SARS-CoV
Antibody-drug Conjugate >
ADC Cytotoxin ADC Linker Drug-Linker Conjugates for ADC PROTAC-linker Conjugate for PAC
Apoptosis >
Apoptosis Bcl-2 Family c-Myc Caspase DAPK Ferroptosis IAP MDM-2/p53 PKD RIP kinase Survivin Thymidylate Synthase TNF Receptor
Autophagy >
Autophagy LRRK2 ULK Mitophagy
Cell Cycle/DNA Damage >
Antifolate APC ATM/ATR Aurora Kinase Casein Kinase CDK Checkpoint Kinase (Chk) CRISPR/Cas9 Deubiquitinase DNA Alkylator/Crosslinker DNA-PK DNA/RNA Synthesis Eukaryotic Initiation Factor (eIF) G-quadruplex Haspin Kinase HDAC HSP IRE1 Kinesin LIM Kinase (LIMK) Microtubule/Tubulin Mps1 Nucleoside Antimetabolite/Analog p97 PAK PARP PERK Polo-like Kinase (PLK) PPAR RAD51 ROCK Sirtuin SRPK Telomerase TOPK Topoisomerase Wee1
Cytoskeleton >
Arp2/3 Complex Dynamin Gap Junction Protein Integrin Kinesin Microtubule/Tubulin Mps1 Myosin PAK
Epigenetics >
AMPK Aurora Kinase DNA Methyltransferase Epigenetic Reader Domain HDAC Histone Acetyltransferase Histone Demethylase Histone Methyltransferase JAK MicroRNA PARP PKC Sirtuin Protein Arginine Deiminase
GPCR/G Protein >
5-HT Receptor Adenosine Receptor Adenylate Cyclase Adiponectin Receptor Adrenergic Receptor Angiotensin Receptor Bombesin Receptor Bradykinin Receptor Cannabinoid Receptor CaSR CCR CGRP Receptor Cholecystokinin Receptor CRFR CXCR Dopamine Receptor EBI2/GPR183 Endothelin Receptor GHSR Glucagon Receptor Glucocorticoid Receptor GNRH Receptor GPCR19 GPR109A GPR119 GPR120 GPR139 GPR40 GPR55 GPR84 Guanylate Cyclase Histamine Receptor Imidazoline Receptor Leukotriene Receptor LPL Receptor mAChR MCHR1 (GPR24) Melatonin Receptor mGluR Motilin Receptor Neurokinin Receptor Neuropeptide Y Receptor Neurotensin Receptor Opioid Receptor Orexin Receptor (OX Receptor) Oxytocin Receptor P2Y Receptor Prostaglandin Receptor Protease-Activated Receptor (PAR) Ras RGS Protein Sigma Receptor Somatostatin Receptor TSH Receptor Urotensin Receptor Vasopressin Receptor Melanocortin Receptor
Immunology/Inflammation >
Aryl Hydrocarbon Receptor CCR Complement System COX CXCR FLAP Histamine Receptor IFNAR Interleukin Related IRAK MyD88 NO Synthase NOD-like Receptor (NLR) PD-1/PD-L1 PGE synthase Salt-inducible Kinase (SIK) SPHK STING Thrombopoietin Receptor Toll-like Receptor (TLR) Arginase
JAK/STAT Signaling >
EGFR JAK Pim STAT
MAPK/ERK Pathway >
ERK JNK KLF MAP3K MAP4K MAPKAPK2 (MK2) MEK Mixed Lineage Kinase MNK p38 MAPK Raf Ribosomal S6 Kinase (RSK)
Membrane Transporter/Ion Channel >
ATP Synthase BCRP Calcium Channel CFTR Chloride Channel CRAC Channel CRM1 EAAT2 GABA Receptor GlyT HCN Channel iGluR Monoamine Transporter Monocarboxylate Transporter Na+/Ca2+ Exchanger Na+/HCO3- Cotransporter Na+/K+ ATPase nAChR NKCC P-glycoprotein P2X Receptor Potassium Channel Proton Pump SGLT Sodium Channel TRP Channel URAT1
Metabolic Enzyme/Protease >
15-PGDH 5 alpha Reductase 5-Lipoxygenase Acetyl-CoA Carboxylase Acyltransferase Adenosine Deaminase Adenosine Kinase Aldehyde Dehydrogenase (ALDH) Aldose Reductase Aminopeptidase Angiotensin-converting Enzyme (ACE) ATGL ATP Citrate Lyase Carbonic Anhydrase Carboxypeptidase Cathepsin CETP COMT Cytochrome P450 Dipeptidyl Peptidase Dopamine β-hydroxylase E1/E2/E3 Enzyme Elastase Enolase FAAH FABP Factor Xa Farnesyl Transferase Fatty Acid Synthase (FAS) FXR Glucokinase GSNOR Gutathione S-transferase HCV Protease Hexokinase HIF/HIF Prolyl-Hydroxylase HIV Integrase HIV Protease HMG-CoA Reductase (HMGCR) HSP Indoleamine 2,3-Dioxygenase (IDO) Isocitrate Dehydrogenase (IDH) Lactate Dehydrogenase LXR MAGL Mineralocorticoid Receptor Mitochondrial Metabolism MMP Nampt NEDD8-activating Enzyme Neprilysin PAI-1 PDHK PGC-1α Phosphatase Phosphodiesterase (PDE) Phospholipase Procollagen C Proteinase Proteasome Pyruvate Kinase RAR/RXR Renin ROR Ser/Thr Protease SGK Stearoyl-CoA Desaturase (SCD) Thrombin Tryptophan Hydroxylase Tyrosinase Xanthine Oxidase
Neuronal Signaling >
5-HT Receptor AChE Adenosine Kinase Amyloid-β Beta-secretase CaMK CGRP Receptor COMT Dopamine Receptor Dopamine Transporter FAAH GABA Receptor GlyT iGluR Imidazoline Receptor mAChR Melatonin Receptor Monoamine Oxidase nAChR Neurokinin Receptor Opioid Receptor Serotonin Transporter γ-secretase
NF-κB >
NF-κB IKK Keap1-Nrf2 MALT1
PI3K/Akt/mTOR >
Akt AMPK ATM/ATR DNA-PK GSK-3 MELK mTOR PDK-1 PI3K PI4K PIKfyve PTEN
PROTAC >
PROTAC E3 Ligase Ligand-Linker Conjugate Ligand for E3 Ligase PROTAC Linker PROTAC-linker Conjugate for PAC
Protein Tyrosine Kinase/RTK >
Ack1 ALK Bcr-Abl BMX Kinase Btk c-Fms c-Kit c-Met/HGFR Discoidin Domain Receptor DYRK EGFR Ephrin Receptor FAK FGFR FLT3 IGF-1R Insulin Receptor IRAK Itk PDGFR PKA Pyk2 ROS Src Syk TAM Receptor Trk Receptor VEGFR
Stem Cell/Wnt >
Casein Kinase ERK Gli GSK-3 Hedgehog Hippo (MST) JAK Notch Oct3/4 PKA Porcupine ROCK sFRP-1 Smo STAT TGF-beta/Smad Wnt YAP β-catenin γ-secretase
TGF-beta/Smad >
TGF-beta/Smad PKC ROCK TGF-β Receptor
Vitamin D Related >
VD/VDR
Others >
Androgen Receptor Aromatase Estrogen Receptor/ERR Progesterone Receptor Thyroid Hormone Receptor Others

Microcystin RR

Microcystin-RR (Cyanoviridin RR) is a potent and orally active protein phosphatase inhibitor. Microcystin-RR induces Apoptosis and ER stress in mice liver[1][2].

  • CAS Number: 111755-37-4
  • MF: C49H75N13O12
  • MW: 1038.200
  • Catalog: Apoptosis
  • Density: 1.4±0.1 g/cm3
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: 11 °C

Lansoprazole Sulfone

Lansoprazole sulfone (AG-1813) is an orally active and selective inhibitor of H+, K+-ATPase. Lansoprazole sulfone can significantly stimulates gastric acid secretion by inhibiting H+, K+-ATPase. Lansoprazole sulfone has potential applications in duodenal ulcer, gastric ulcer, gastroesophageal reflux disease and Zolinger Ellison disease[1][2].

  • CAS Number: 131926-99-3
  • MF: C16H14F3N3O3S
  • MW: 385.361
  • Catalog: Proton Pump
  • Density: 1.5±0.1 g/cm3
  • Boiling Point: 555.6±60.0 °C at 760 mmHg
  • Melting Point: 207ºC(dec.)
  • Flash Point: 289.8±32.9 °C

GSK837149A

GSK837149A is a selective inhibitor of human Fatty Acid Synthase (FASN) targeting the KR domain. GSK837149A has reversible inhibition effect on FASN and selectivity for type I FASN (Ki=30 nM). GSK837149A is also a competitive inhibitor of NADPH and a non-competitive inhibitor of acetoacetyl-CoA. GSK837149A can be used for the research of obesity and breast cancer[1][2].

  • CAS Number: 13616-29-0
  • MF: C23H22N8O5S2
  • MW: 554.60100
  • Catalog: Fatty Acid Synthase (FAS)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Lopixibat chloride

Lopixibat chloride (LUM-001, HP-625) is a potent, selectiove, oral inhibitor of sodium bile acid cotransporter and Ileal bile acid transporter (IBAT). Hypercholesterolemia Phase 2 Clinical

  • CAS Number: 228113-66-4
  • MF: C40H56ClN3O4S
  • MW: 710.408
  • Catalog: Metabolic Disease
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

TH10785

TH10785 is a DNA glycosylase 1 (OGG1) activator, TH10785 can interact with the phenylalanine-319 and glycine-42 amino acids of OGG1 and increase the enzyme activity, generates β,δ-lyase enzymatic function. TH10785 can control the catalytic activity mediated by a nitrogen base within its molecular structure. TH10785 can be used for the research of various diseases and aging connected with DNA oxidative lesions[1].

  • CAS Number: 1002801-51-5
  • MF: C17H21N3
  • MW: 267.37
  • Catalog: Others
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Evocalcet

Evocalcet has an activating effect on calcium sensing receptor (CaSR) extracted from patent WO 2017061621 A1, compound A.

  • CAS Number: 870964-67-3
  • MF: C24H26N2O2
  • MW: 374.475
  • Catalog: CaSR
  • Density: 1.2±0.1 g/cm3
  • Boiling Point: 594.4±50.0 °C at 760 mmHg
  • Melting Point: N/A
  • Flash Point: 313.3±30.1 °C

STL1267

STL1267 is a potent and cross-the-blood-brain barrier REV-ERB agonist with a Ki value of 0.16 µM for REV-ERBα. STL1267 shows no cytotoxicity. STL1267 inhibits the gene expression of BMAL1[1].

  • CAS Number: 1429024-58-7
  • MF: C17H11ClN4O
  • MW: 322.75
  • Catalog: Cancer
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

N-Methyltyramine

N-Methyltyramine is a protoalkaloid that can be isolated from various plant species. N-Methyltyramine is an α2-adrenoreceptor antagonist. N-Methyltyramine enhances appetite and digestion of foods by stimulating gastrin and pancreatic secretions. N-Methyltyramine can relax mouse small intestinal smooth muscle and inhibits small intestinal propulsion[1][2].

  • CAS Number: 370-98-9
  • MF: C9H13NO
  • MW: 151.21
  • Catalog: Adrenergic Receptor
  • Density: 1.0±0.1 g/cm3
  • Boiling Point: 270.9±15.0 °C at 760 mmHg
  • Melting Point: 121 - 126°C(lit.)
  • Flash Point: 119.7±11.0 °C

Axltide trifluoroacetate salt

Axltide is based on the mouse Insulin receptor substrate 1 (amino acid 979-989). Axltide is a substrate for Axl, DDR2, Mst1, and JAK2 kinases[1].

  • CAS Number: 143364-95-8
  • MF: C63H107N19O20S2
  • MW: 1514.77
  • Catalog: Metabolic Disease
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

APOL1-IN-1

APOL1-IN-1 is a apolipoprotein L1 (APOL1) inhibitor extracted from patent WO2020131807A1 compound 87. APOL1-IN-1 can be used for the research of focal segmental glomerulosclerosis (FSGS) and non-diabetic kidney disease (NDKD)[1].

  • CAS Number: 2446817-72-5
  • MF: C21H20FN3O3
  • MW: 381.40
  • Catalog: Metabolic Disease
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

BI‑3231

BI 3231 is a potent and selective hydroxysteroid 17ß-dehydrogenase 13 (HSD17B13) inhibitor, with IC50s of 1 and 13 nM for hHSD17B13 and mHSD17B13, respectively. BI 3231 has the potential for the research of nonalcoholic steatohepatitis (NASH) and other liver diseases[1].

  • CAS Number: 2894848-07-6
  • MF: C16H14F2N4O3S
  • MW: 380.37
  • Catalog: Metabolic Disease
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

4-Phenyltoluene

4-Methylbiphenyl is an endogenous metabolite.

  • CAS Number: 644-08-6
  • MF: C13H12
  • MW: 168.234
  • Catalog: Metabolic Disease
  • Density: 1.0±0.1 g/cm3
  • Boiling Point: 267.8±0.0 °C at 760 mmHg
  • Melting Point: 44-47 °C(lit.)
  • Flash Point: 117.8±9.7 °C

CB1 inverse agonist 1

CB1 inverse agonist 1 is a highly potent, orally active, and specific inverse agonist of CB1 receptor with IC50s of 7.5 nM and 4100 nM for CB1 and CB2 receptors, respectively. Anorexigenic effects[1].

  • CAS Number: 852315-00-5
  • MF: C25H18Cl3N3O3
  • MW: 514.79
  • Catalog: Cannabinoid Receptor
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

2-Quinizarincarboxylic acid

2-Quinizarincarboxylic acid (Compound 15) is a glucose uptake inhibitor, with the inhibitory rate of 24.9% at 50 μM[1].

  • CAS Number: 6416-55-3
  • MF: C15H8O6
  • MW: 284.22
  • Catalog: Metabolic Disease
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

PF-4618433

PF-4618433 is a potent and selective PYK2 inhibitor, with an IC50 of 637 nM. PF-4618433 may be suitable for the research of osteoporosis, craniofacial and appendicular skeletal defects and for targeted bone regeneration[1][2].

  • CAS Number: 1166393-85-6
  • MF: C24H27N7O2
  • MW: 445.517
  • Catalog: Pyk2
  • Density: 1.3±0.1 g/cm3
  • Boiling Point: 587.6±50.0 °C at 760 mmHg
  • Melting Point: N/A
  • Flash Point: 309.2±30.1 °C

CP-91149

CP-91149 is a GP (glycogen phosphorylase) inhibitor. CP-91149 promotes glycogen resynthesis, but not its overaccumulation. CP-91149 has the potential for Type II (insulin-dependent) diabetes study[1].

  • CAS Number: 186392-40-5
  • MF: C21H22ClN3O3
  • MW: 399.87100
  • Catalog: Metabolic Disease
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: 190-192°C
  • Flash Point: N/A

Calcifediol

Calcifediol is a major circulating metabolite of vitamin D3, acting as a competitive inhibitor with an apparent Ki of 3.9 μM, suppresses PTH secretion and mRNA (ED50=2 nM).

  • CAS Number: 19356-17-3
  • MF: C27H44O2
  • MW: 400.637
  • Catalog: VD/VDR
  • Density: 1.0±0.1 g/cm3
  • Boiling Point: 529.2±33.0 °C at 760 mmHg
  • Melting Point: 74-76oC
  • Flash Point: 221.4±20.0 °C

GLP-1R modulator C5

GLP-1R modulator C5 is an allosteric modulator enhancing GLP-1 binding to GLP-1R via a transmembrane site (EC50 1.59 ± 0.53 μM).

  • CAS Number: 421578-93-0
  • MF: C24H21NO3
  • MW: 371.43
  • Catalog: Glucagon Receptor
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Secretin (human)

Secretin (28-54), human is a 27-amino acid residue C-terminally amidated peptide, which acts on secretin receptors.

  • CAS Number: 108153-74-8
  • MF: C130H220N44O40
  • MW: 3039.409
  • Catalog: Peptides
  • Density: 1.5±0.1 g/cm3
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Ganoapplanoid F

Ganoapplanoid F, a highly oxygenated lanostane triterpenoid from Ganoderma applanatum, inhibits lipid accumulation in adipocytes. Ganoapplanoid F can be used for the research of obesity[1].

  • CAS Number: 2758812-34-7
  • MF: C29H38O10
  • MW: 546.61
  • Catalog: Metabolic Disease
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Hepcidin-25 (human) (acetate)

Hepcidin-25 (human) acetate is an iron metabolism modulator. Hepcidin-25 (human) acetate shows anti-inflammatory and anti-bacterial activity via modulation of iron-mediated oxidant injury[1].

  • CAS Number: 2222618-29-1
  • MF: C113H170N34O31S9.xC2H4O2
  • MW: 2789.35 (free base)
  • Catalog: Metabolic Disease
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Maohuoside A

Maohuoside A, a single compound isolated from the E. koreanum that potently promotes osteogenesis. Maohuoside A enhances the osteogenesis of bone marrow-derived mesenchymal stem cells via bone morphogenetic protein (BMP) and MAPK signaling pathways[1][2].

  • CAS Number: 128988-55-6
  • MF: C27H32O12
  • MW: 548.536
  • Catalog: Metabolic Disease
  • Density: 1.5±0.1 g/cm3
  • Boiling Point: 838.2±65.0 °C at 760 mmHg
  • Melting Point: 222-224℃
  • Flash Point: 278.8±27.8 °C

RU28362

RU28362 is a potent and selective glucocorticoid agonist. RU28362 increases the Bnip3 mRNA levels in neurons. RU28362 inhibits adrenocorticotrophic hormone (ACTH) and corticosterone secretion[1][2].

  • CAS Number: 74915-64-3
  • MF: C23H28O3
  • MW: 352.47
  • Catalog: Glucocorticoid Receptor
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Xanthine oxidase-IN-8

Xanthine oxidase-IN-8 (Icarisids J) (Compound 7) is a XOD inhibitor with an IC50 of 29.71 μM[1].

  • CAS Number: 2571069-66-2
  • MF: C44H58O23
  • MW: 954.92
  • Catalog: Xanthine Oxidase
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

N-Acetyl-D-glucosamine-13C-3

N-Acetyl-D-glucosamine-13C-3 is the 13C labeled N-Acetyl-D-glucosamine. N-Acetyl-D-Glucosamine (N-Acetyl-2-amino-2-deoxy-D-glucose) is a monosaccharide derivative of gluc[1][2].

  • CAS Number: 478529-39-4
  • MF: C8H15NO6
  • MW: 222.20000
  • Catalog: Metabolic Disease
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

H-Leu-Gly-βNA

H-Leu-Gly-βNA can be used as a substrate to detect the presence or absence of N-acetyl-BD-galactosaminidase[1].

  • CAS Number: 100930-00-5
  • MF: C18H23N3O2
  • MW: 313.39
  • Catalog: Metabolic Disease
  • Density: 1.177g/cm3
  • Boiling Point: 605ºC at 760 mmHg
  • Melting Point: N/A
  • Flash Point: 319.7ºC

1-Phenylpropane-1,2-dione

1-Phenylpropane-1,2-dione, isolated from young Ephedra sinica Stapf (Ephedraceae), is biosynthetic precursors of the ephedrine alkaloids[1][2].

  • CAS Number: 579-07-7
  • MF: C9H8O2
  • MW: 148.159
  • Catalog: Others
  • Density: 1.1±0.1 g/cm3
  • Boiling Point: 228.0±9.0 °C at 760 mmHg
  • Melting Point: <20ºC
  • Flash Point: 84.4±0.0 °C

WAY 252623

LXR-623 is a brain-penetrant partial LXRα and full LXRβ agonist, with IC50s of 24 nM and 179 nM, respectively.

  • CAS Number: 875787-07-8
  • MF: C21H12ClF5N2
  • MW: 422.778
  • Catalog: LXR
  • Density: 1.4±0.1 g/cm3
  • Boiling Point: 528.4±50.0 °C at 760 mmHg
  • Melting Point: 100 °C
  • Flash Point: 273.4±30.1 °C

SGC-SMARCA-BRDVIII

SGC-SMARCA-BRDVIII is a potent and selective inhibitor of SMARCA2/4 and PB1(5), with Kds of 35 nM, 36 nM, and 13 nM, respectively. SGC-SMARCA-BRDVIII also inhibits PB1(2) and PB1(3), with Kds of 3.7 and 2.0 μM, respectively. SGC-SMARCA-BRDVIII can block adipogenesis of 3T3-L1 murine fibroblasts[1][2].

  • CAS Number: 1997319-84-2
  • MF: C19H25N5O3
  • MW: 371.43
  • Catalog: Epigenetic Reader Domain
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Fudosteine

Fudosteine is a novel mucoactive agent and a MUC5AC mucin hypersecretion inhibitor.Target: OthersFudosteine is a cysteine derivative that is used as an expectorant in chronic bronchial inflammatory disorders. The administration of fudosteine during the challenge with ovalbumin prevented the development of airway hyperresponsiveness and accumulation of lymphocytes in the airways. Eotaxin, IL-4, and TGF-β levels and the relative intensity of matrix metalloproteinase-2 and matrix metalloproteinase-9 (MMP-2 and MMP-9) in BAL fluid were reduced by the fudosteine treatment; however, the number of eosinophils in BAL fluid and serum IgE levels did not change. The expression of TGF-β, the development of goblet cell hyperplasia, subepithelial collagenization, and basement membrane thickening were also reduced by the fudosteine treatment [1]. Fudosteine inhibits MUC5AC mucin hypersecretion by reducing MUC5AC gene expression and the effects of fudosteine are associated with the inhibition of extracellular signal-related kinase and p38 mitogen-activated protein kinase in vivo and extracellular signal-related kinase in vitro [2].

  • CAS Number: 13189-98-5
  • MF: C6H13NO3S
  • MW: 179.237
  • Catalog: Metabolic Disease
  • Density: 1.3±0.1 g/cm3
  • Boiling Point: 354.5±42.0 °C at 760 mmHg
  • Melting Point: 210.9-212.5ºC
  • Flash Point: 168.2±27.9 °C