InChI=1S/C20H22O7/c1-23-17-7-11(3-5-15(17)21)19-13-9-26-20(14(13)10-25-19)27-12-4-6-16(22)18(8-12)24-2/h3-8,13-14,19-22H,9-10H2,1-2H3/t13?,14-,19?,20+/m0/s1