InChI=1S/C22H30O4/c1-13-6-7-18-21(2,3)8-5-9-22(18,4)16(13)10-14-11-17(24)20(26)15(12-23)19(14)25/h10-13,18,24-26H,5-9H2,1-4H3/b16-10+