4-oxazolidinone,3-ethyl-5-[(3-methyl-2-thiazolidinylidene)ethylidene]-2-thioxo;BLUE SENSITIZER STO 749;2-THIOXO-3-ETHYL-4-OXO-5-(2-(N-METHYL-1,3-THIAZOLIN-2-YLIDEN)-ETH-1-YLIDEN)-1,2-OXAZOLIDINE;3-ETHYL-5-[2-(3-METHYL-2-THIAZOLIDIN-YLIDENE)ETHYLIDENE]-2-