InChI=1S/C18H20O5/c1-10-15(21-2)9-16(22-3)13-8-14(20)18(23-17(10)13)11-4-6-12(19)7-5-11/h4-7,9,14,18-20H,8H2,1-3H3/t14-,18+/m0/s1