1,9-Dihydroxy-10-methoxy-1-methyl-2,3,5,5a,11b,11c-hexahydro-1.lambda.~5~-isochromeno[3,4-g]indol-7(1H)-one AIDS-136607 AIDS136607 Lycorine, homo- 9-O-demethyl-N-oxide- (+)- NSC638474