3-Methyl-1,2,3,4-tetrahydro-5H-pyrido(3,2-b)indole-5-carboxylic acid 3-Methyl-5-carboxytetrahydro-4-carboline 5H-Pyrido(3,2-b)indole-5-carboxylic acid, 1,2,3,4-tetrahydro-3-methyl- 63869-96-5