Synthesis of 1,2,3,4-Tetrahydro-.Beta.-Carboline Derivatives as Hepatoprotective Agents. IV. Positional Isomers of 1,2,3,4-Tetrahydro-2-Methylthiothiocarbonyl-.Beta.-Carboline-3-Carboxylic Acid and Its 1-Alkylated Derivatives.

Chemical and Pharmaceutical Bulletin - Japan
doi 10.1248/cpb.35.3705