InChI=1S/C21H22O5/c1-11(2)4-5-12-16(22)7-6-13-20(12)25-10-15-14-8-19(24-3)17(23)9-18(14)26-21(13)15/h4,6-9,15,21-23H,5,10H2,1-3H3/t15-,21-/m0/s1