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