InChI=1S/C18H22O6/c19-15-8-11-7-14-10(2-1-3-16(14)24-9-18(22)23)6-13(11)12(15)4-5-17(20)21/h1-3,11-13,15,19H,4-9H2,(H,20,21)(H,22,23)/t11-,12+,13-,15+/m0/s1