Synonyms: Formosanan-16-carboxylicacid, 19-methyl-2-oxo-, methyl ester, (19a,20a)-; Pteropodine (7CI,8CI); NSC 113093; Pteropodin;Spiro[3H-indole-3,6'(4'aH)-[1H]pyrano[3,4-f]indolizine]-4'-carboxylic acid,1,2,5',5'a,7',8',10',10'a-octahydro-1'-methyl-2-oxo-, methyl ester, [1'S-(1'a,4'aa,5'aa,6'b,10'aa)]-; Uncarin C; Uncarine C; allo-Pteropodine