Abstract Using 1 H and 13 C NMR, 13 C-labelled modifications of 2-amino-4-(5-nitro-2-furyl) thiazole (ANFT) and its N-formyl analogue N-[4-(5-nitro-2-furyl)-2-thiazolyl] formamide (FANFT), as well as the 5-(S)-substituted glutathione and N-acetylcysteine conjugates of prostaglandin H synthase-catalyzed peroxidative metabolism of ANFT were studied. 1 H and 13 C NMR chemical shifts, heteronuclear coupling constants, spin–lattice relaxation times ...