NEW MATERIAL:A compound expressed by formula I[R1 and R3 are H, methyl, ethyl, methoxy, ethoxy, acetylamino, benzoylamino or ureido; R2 and R4 are H, methyl, ethyl, methoxy or ethoxy; X and Y are 2W4C alkyl, etc.-substituted amino, cyclohexylamino, piperidino, morpholino, benzylamino or (substituted) anilino, provided that the carboxyl group is linked to the benzene nucleus at the 2- or 3-position] as a free acid.

EXAMPLE: A compound expressed by formula II.

USE: A dye for dyeing cellulosic fibers to yellow color.

PREPARATION: For example, an aminoazo compound expressed by formula III or IV is first prepared as a free acid, and firstly condensed with a cyanuric trihalide to produce an azo compound expressed by formula V or VI (Z is halogen), which is then secondly condensed with 2,5-diaminobenzoic acid. The resultant product is then thirdly condensed with an alkyl- or alkanolamine, etc.