InChI=1S/C21H30O4/c1-5-6-7-8-13-9-16(22)19-14-12-21(4,24)18(23)11-15(14)20(2,3)25-17(19)10-13/h9-10,18,22-24H,5-8,11-12H2,1-4H3/t18-,21+/m0/s1