InChI=1S/C21H30O4/c1-6-8-13-11-15(22)18-16(12-13)25-20(3,4)14-9-10-21(5,23)19(17(14)18)24-7-2/h11-12,19,22-23H,6-10H2,1-5H3/t19-,21-/m0/s1