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In this paper, direct photooxidation of benzothiazolone cyanine dye in acetonitrile was studied. The photoproducts had beed identified by 1HNMR and fast atom bombardment (FAB)mass spectrometry. The resultS showed that the N-ethylbenzothiazolone (I), the ionic acid (II), and ionic aldehyde (III are the principal Photoproducts.