1. Compounds of the general formula (1) see diagramm : EP0064721,P12,F2 wherein M is a hydrogen atom or the equivalent of a metal, R is a hydrogen atom or the methyl, ethyl, methoxy or ethoxy group, and the vinylsulfonyl group in the benzene nucleus is in the meta- or para-position relative to the acylated amino group, and the second group of the formula -SO3 M in the naphthalene nucleus is bound in the meta-position relative to the acylated amino group.