(1R-trans)-2,3,4,9-Tetrahydro-1-methyl-1H-pyrido(3,4-b)indole-3-carboxylic acid 1H-Pyrido(3,4-b)indole-3-carboxylic acid, 2,3,4,9-tetrahydro-1-methyl-, (1R-trans)- 42438-72-2