InChI=1S/C18H18O7/c1-2-3-4-5-7-11-8-6-9-12(10-11)24-18-15(21)13(19)14(20)16(25-18)17(22)23/h6,8-10,13-16,18-21H,7H2,1H3,(H,22,23)