(1S,3aR,4S,6aR)-1,4-bis(3,4-dimethoxyphenyl)tetrahydro-1H,3H-furo[3,4-c]furan & (1R,3aS,6aS)-1,4-bis(3,4-dimethoxyphenyl)tetrahydro-1H,3H-furo[3,4-c]furan AIDS-050928 AIDS050928 EUSDESMIN & EPIEUDESMIN NSC294572