(16E,20-alpha)-16,17-Didehydro-17-methoxy-2-oxo-corynoxan-16-carboxylic acid 6859-01-4 7-Isorhyncophylline (8CI) Corynoxan-16-carboxylic acid, 16,17-didehydro-17-methoxy-2-oxo-, methyl ester, (16E,20-alpha)- Isorhynchophylline Isorhyncophylline