InChI=1S/C18H26O11/c1-23-15(19)3-5-17(21)28-13-11-26-9-7-25-8-10-27-12-14-29-18(22)6-4-16(20)24-2/h3-6H,7-14H2,1-2H3/b5-3+,6-4+