InChI=1/C20H18O5/c21-16-6-4-12(10-18(16)23)8-14-2-1-3-15(20(14)25)9-13-5-7-17(22)19(24)11-13/h4-11,21-24H,1-3H2/b14-8+,15-9+ C012771FB4720709