ethyl 2-{[(19alpha,20alpha)-19-methyl-16,17-didehydro-18-oxayohimban-16-yl]carbonyl}hydrazinecarboxylate hydrochloride
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4H-Indolo[2,3-a]pyrano[3,4-g]quinolizine,oxayohimban-16-carboxylic acid deriv.