InChI=1S/C21H30O4/c1-12(2)14-11-13-7-8-15-20(3,4)9-6-10-21(15,19(24)25-5)16(13)18(23)17(14)22/h11-12,15,22-23H,6-10H2,1-5H3/t15?,21-/m1/s1