InChI=1S/C21H31O4/c1-12(22)21(25)11-7-15-13-4-5-16-18(24)17(23)8-9-19(16,2)14(13)6-10-20(15,21)3/h5,13-15,17-18,24-25H,4,6-11H2,1-3H3/t13?,14?,15?,17?,18?,19-,20+,21+/m1/s1