InChI=1S/C21H30O4/c1-12(23)19-18(25)10-17-15-4-3-13-9-14(24)5-8-21(13,11-22)16(15)6-7-20(17,19)2/h3,15-19,22,25H,4-11H2,1-2H3/t15?,16?,17?,18?,19?,20-,21+/m0/s1