29089-93-8 4a-(2-(3-Ethyl-5,6-dihydro-1(2H)-pyridinyl)ethyl)-4-(3-(2-(3-ethyl-5,6-dihydro-1(2H)-pyridinyl)ethyl)-1H-indol-2-yl)-3,4,4a,9-tetrahydro-2H-carbazole-1,4-dicarboxylic acid, dimethyl ester Presecamine