5-Oxo-4-((4-oxo-4H-thieno[2,3-b]thiochromen-2-yl)methylene)-1-phenyl-4,5-dihydro-1H-imidazol-2-yl 2,3,4,6-tetra-O-acetyl-1-thiohexopyranoside AIDS-148084 AIDS148084 NSC679247