InChI=1S/C21H28O4/c1-14(11-21(23)24)7-6-8-18(13-22)9-10-19-15(2)12-20(25-5)17(4)16(19)3/h6-10,12,14,22H,11,13H2,1-5H3,(H,23,24)/b7-6+,10-9+,18-8-