InChI=1S/C21H30O4/c1-13(23)21(25)10-7-18-16-4-3-14-11-15(24)5-8-19(14,2)17(16)6-9-20(18,21)12-22/h11,16-18,22,25H,3-10,12H2,1-2H3/t16-,17+,18+,19+,20-,21+/m1/s1