BLUE SENSITIZER BCH 2216;2-THIOXO-3-ALLYL-2-4-OXO-5-(N-METHYL-PYRID-2-YLIDEN)-1,3-THIAZOLDINE;3-ALLYL-5-(1-METHYL-2-PYRIDYLIDENE)-RHODANINE;3-ALLYL-5-(1'-METHYL-PYRIDINYLIDENE)-RHODANINE;3-allyl-5-(1-methyl-2(1H)-pyridylidene)-Rhodanine;4-Thiazolidinone,