InChI=1S/C21H22O5/c1-13(4-6-18-21(2,3)26-18)8-10-24-20-14-5-7-19(22)25-17(14)12-16-15(20)9-11-23-16/h5,7-9,11-12,18H,4,6,10H2,1-3H3/b13-8-