Synonyms: Corynoxan-16-carboxylicacid, 16,17,18,19-tetradehydro-17-methoxy-2-oxo-, methyl ester, (7b,16E,20a)-; Corynoxeine (6CI,7CI);Corynoxein; Spiro[3H-indole-3,1'(5'H)-indolizine]-7'-acetic acid,6'-ethenyl-1,2,2',3',6',7',8',8'a-octahydro-a-(methoxymethylene)-2-oxo-, methyl ester, [1'R-[1'a,6'b,7'a(E),8'ab]]-;D18-Rhyncophylline; d18-Rhynchophylline