InChI=1/C21H34O7/c1-13(2)7-5-8-14(3)9-6-10-15(4)11-12-27-21-18(24)16(22)17(23)19(28-21)20(25)26/h7,9,11,16-19,21-24H,5-6,8,10,12H2,1-4H3,(H,25,26)/b14-9+,15-11+