InChI=1S/C21H22O7/c1-20(2,19(23)24)7-8-21(3)16(28-21)11-26-18-12-4-5-17(22)27-15(12)10-14-13(18)6-9-25-14/h4-6,9-10,16H,7-8,11H2,1-3H3,(H,23,24)