InChI=1S/C21H24O7/c22-16-17(23)19(20(25)26)28-21(18(16)24)27-15(11-13-7-3-1-4-8-13)12-14-9-5-2-6-10-14/h1-10,15-19,21-24H,11-12H2,(H,25,26)