5171-37-9 AIDS-031401 AIDS031401 Isopteropodin NSC601678 Spiro[3H-indole-3,6'(10'H)-[1H]pyrano[3,4-f]indolizine]-4'-carboxylic acid, 1,2,4'a,5',5'a,7',8',10'a-octahydro-1'-methyl-2-oxo-, methyl ester, (1'R,4a'R,10a'R)-