1,2,3,4-Tetrahydro-2-methyl-5H-pyrido(4,3-b)indole-8-carboxylic acid ethyl ester HCl 36911-68-9 5H-Pyrido(4,3-b)indole-8-carboxylic acid, 1,2,3,4-tetrahydro-2-methyl-, ethyl ester, hydrochloride 8-(Ethoxycarbonyl)-2-methyl-1,2,3,4-tetrahydro-gamma-carboline hydrochloride