(6-((6-Deoxyhexopyranosyl)oxy)-2-(hexopyranosyloxy)-1b,5a,6,6a-tetrahydrooxireno[2',3':4,5]cyclopenta[1,2-c]pyran-1a(2H)-yl)methyl 3-phenylacrylate AIDS-152996 AIDS152996 NSC698567