4-[2-(1-methylpyridin-4-ylidene)ethylidene]cyclohexa-2,5-dien-1-one 4-[2-(1-methyl-4-pyridylidene)ethylidene]cyclohexa-2,5-dien-1-one 4-[2-(1-methyl-4-pyridylidene)ethylidene]-1-cyclohexa-2,5-dienone 23302-83-2 NCIOpen2_005368 MLS000737143 NSC87344 SMR000528389