6-((4-O-Acetyl-2,3-di-O-cinnamoyl-6-deoxyhexopyranosyl)oxy)-1a-(hydroxymethyl)-1a,1b,2,5a,6,6a-hexahydrooxireno[2',3':4,5]cyclopenta[1,2-c]pyran-2-yl hexopyranoside AIDS-141155 AIDS141155 Koelzioside NSC655893