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A novel compound of butyl crystal violet lactone (BCVL) has been prepared by oxidizing leuco butyl crystal violet lactone (LBCVL),which was obtained by the mixture of N,N-dibutylaniline,p-(dibutylamino) benzaldehyde and methyl-m-(dibutylamino) benzoate.The structure of BCVL was characterized by 1H- nuclear magnetic resonance (NMR),infrared OR),and mass spectrometry (MS).The color of BCVL can change reversibly in some acid or alkali solvents.The result of the dissolution experiment showed that solubility of BCVL in organic solvent was improved compared with crystal violet lactone (CVL).