3-Carbo-t-butoxy-beta-carboline 3-Carboxy-tert-butoxy-beta-carboline 93835-05-3 9H-Pyrido(3,4-b)indole-3-carboxylic acid, 1,1-dimethylethyl ester beta-Carboline-3-carboxylate t-butyl ester beta-Carboline-3-carboxylate-t-butyl ester beta-Cct beta-Cctb tert-Butyl beta-carboline-3-carboxylate