The compound of the formula (written in the form of a free acid) ##STR22##has very good fiber-reactive dyestuff properties and in aqueous solution an absorption peak at 506 nm and dyes in particular cellulose fiber materials, such as cotton, by the application and fixing methods known for fiber-reactive dyestuffs in theindustry in fast brown, deep shades.EXAMPLES 76 TO 96The tabled Examples below