A bisazo reactive compound represented by a free acid of the formula,wherein X is -CH=CH2 or -CH2CH2R (R is a group capable of being split off with an alkali); Y is phenylene group or naphthylene group, said phenylene group being unsubstituted or substituted by 1 - 3 identical or different substituent(s) selected from C1-C4 alkyl groups, C1-C4 alkoxy groups, chlorine atom and bromine atom, and said naphthylene group being unsubstituted or substituted by 1 - 3 sulfonic acid group(s); and Z is hydrogen atom, halogen atom, nitro group, cyano group, C,-C4 alkyl group or C1-C4 alkoxy group. The compound is useful for dyeing cellulose, polyamide or polyurethane fibers in a blue-black color having excellent fastnesses, particularly chlorine fastness, and excellent build-up property.
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