1H-isoindole-1,3(2H)-dione, 2-[3-methyl-1-(tetrahydro-4-methylene-5-oxo-2-furanyl)butyl]- 2-[3-methyl-1-(4-methylene-5-oxotetrahydrofuran-2-yl)butyl]-1H-isoindole-1,3(2H)-dione InChI=1/C18H19NO4/c1-10(2)8-14(15-9-11(3)18(22)23-15)19-16(20)12-6-4-5-7-13(12)17(19)21/h4-7,10,14-15H,3,8-9H2,1-2H