6-(6-Hydroxy-1-benzofuran-2-yl)-8a-(5-hydroxy-2,2-dimethyl-2H-chromen-8-yl)-2-methyl-1,8a,13b,13c-tetrahydro-3aH-benzo[3,4]isochromeno[1,8-bc]chromene-4,11-diol AIDS-139610 AIDS139610 Mulberrofuran G NSC649228