InChI=1S/C21H22O5/c1-12(2)9-10-14-18(23)21(25-3)19(24)17-15(22)11-16(26-20(14)17)13-7-5-4-6-8-13/h4-9,16,23-24H,10-11H2,1-3H3/t16-/m0/s1