InChI=1/C27H28O15/c1-36-13-5-9(3-4-12(13)29)17(30)10-6-27(42-24(10)35)16-15(21-22(27)40-21)11(23(34)37-2)8-38-25(16)41-26-20(33)19(32)18(31)14(7-28)39-26/h3-6,8,14-16,18-22,25-26,28-29,31-33H,7H2,1-2H3/t14?,15?,16?,18?,19?,20?,21-,22-,25-,26?,27-/m0/s Yopaaoside A methyl rel-(1a'R,2R,5'R,6a'R)-5'-(hexopyranosyloxy)-4-(4-hydroxy-3-methoxybenzoyl)-5-oxo-1a',5',5a',6a'-tetrahydro-1b'H,5H-spiro[furan-2,6'-oxireno[3,4]cyclopenta[1,2-c]pyran]-2'-carboxylate spiro[furan-2(5H),6'(5'H)-oxireno[3,4]cyclopenta[1,2-c]pyran]-2'-carboxylic acid, 5'-(hexopyranosyloxy)-1'a,1'b,5'a,6'a-tetrahydro-4-(4-hydroxy-3-methoxybenzoyl)-5-oxo-, methyl ester, (1a'S,2S,5'S,6a'