InChI=1S/C21H31O4/c1-11(22)18-16(24)9-15-14-5-4-12-8-13(23)6-7-20(12,2)19(14)17(25)10-21(15,18)3/h4,13-19,24-25H,5-10H2,1-3H3/t13?,14?,15?,16?,17?,18?,19?,20-,21-/m0/s1