InChI=1S/C18H18O6/c1-18(2)11-7-14(22)13(21)5-9(11)17-16(24-18)6-10-12(20)3-8(19)4-15(10)23-17/h3-5,7,16-17,19-22H,6H2,1-2H3/t16-,17+/m0/s1