132943-52-3 3-ethyl-1-formyl-8-methoxy-4-oxo-4,6,7,12-tetrahydro-indolo[2,3-alpha]quinolizine-2-carboxylic acid methyl ester InChI=1/C21H20N2O5/c1-4-11-16(21(26)28-3)13(10-24)19-18-12(8-9-23(19)20(11)25)17-14(22-18)6-5-7-15(17)27-2/h5-7,10,22H,4,8-9H2,1-3H Mitragynaline indolo[2,3-a]quinolizine-2-carboxylic acid, 3-ethyl-1-formyl-4,6,7,12-tetrahydro-8-methoxy-4-oxo-, methyl ester methyl 3-ethyl-1-formyl-8-methoxy-4-oxo-4,6,7,12-tetrahydroindolo[2,3-a]quinolizine-2-carboxylate