1(3H)-Isobenzofuranone, 3-(benzo(f)quinolin-3-ylmethylene)- 3-((2-Benzo(f)quinolyl)methylidene)-1(3H)-isobenzofuranone 3-(Benzo(f)quinolin-3-ylmethylene)phthalide 67828-73-3 EINECS 267-292-1