InChI=1S/C21H26O6/c1-26-20-11-14(5-9-18(20)24)3-7-16(22)13-17(23)8-4-15-6-10-19(25)21(12-15)27-2/h3-5,7-9,11,15,19,21,24-25H,6,10,12-13H2,1-2H3/b7-3+,8-4+