InChI=1S/C20H20O5/c1-11(2)3-5-13-16(22)8-6-14-18(13)24-10-20(23)15-7-4-12(21)9-17(15)25-19(14)20/h3-4,6-9,19,21-23H,5,10H2,1-2H3