InChI=1S/C21H24O6/c1-12(2)5-7-15-20(26-3)11-19(25)16(21(15)27-4)10-18(24)14-8-6-13(22)9-17(14)23/h5-6,8-9,11,22-23,25H,7,10H2,1-4H3