10,10'-Dihydroxy-7,7'-dimethoxy-3,3'-dimethyl-3,3',4,4'-tetrahydro-1H,1'H-8,8'-bibenzo[g]isochromene-1,1',6,6',9,9'-hexone 1685-91-2 AIDS-016637 AIDS016637 NSC264720 Xanthomegnine