Motivated by the identification of numerous novel tetrahydro-β-carboline-carboxylic acids in food samples, we studied the reactions of tetrahydro-β-carbolines in the presence of nitrosating agents. The anticipated formation of nitroso derivatives from unsubstituted tetrahydro-β-carbolines, and from tetrahydro-β-carboline-3-carboxylic acids was indicated by HPLC-MS/MS analysis and validated by the characteristic product ion spectra of the ...
![1H-Pyrido[3,4-b]indole-3-carboxylicacid, 2,3,4,9-tetrahydro-1-methyl- Structure](https://image.chemsrc.com/caspic/209/5470-37-1.png)
![1H-Pyrido[3,4-b]indole,2,3,4,9-tetrahydro-1-methyl- Structure](https://image.chemsrc.com/caspic/473/2506-10-7.png)
