6-Acetyl-3-benzyl-10b-(1,1-dimethyl-2-propenyl)-6,10b,11,11a-tetrahydro-2H-pyrazino[2',1':5,1]pyrrolo[2,3-b]indole-1,4(3H,5aH)-dione AIDS-136097 AIDS136097 Fructigenine A NSC637143