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