InChI=1S/C20H20O5/c1-18-7-13(21)10-5-6-23-15(10)11-3-4-12-17(22)24-9-20(12,16(11)18)8-14-19(18,2)25-14/h4-6,11,14,16H,3,7-9H2,1-2H3/t11-,14-,16+,18+,19-,20+/m0/s1