InChI=1S/C21H30O5/c1-19(2)10-5-11-21(19,4)16-8-6-15(7-9-16)18(24)26-13-12-20(3,25)14-17(22)23/h6-9,25H,5,10-14H2,1-4H3,(H,22,23)/t20-,21-/m1/s1