1(3H)-isobenzofuranone, 3-[3-[4-(dimethylamino)phenyl]-2-propenylidene]- 3-{3-[4-(dimethylamino)phenyl]prop-2-en-1-ylidene}-2-benzofuran-1(3H)-one InChI=1/C19H17NO2/c1-20(2)15-12-10-14(11-13-15)6-5-9-18-16-7-3-4-8-17(16)19(21)22-18/h3-13H,1-2H3/b6-5+,18-9