Fluorescerende hvitemidler

摘要

The present invention provides new compounds having the formula: in which X is O or NH; M is hydrogen, an alkali metal atom, ammonium or a cation formed from an amine; each R1, independently, is an aminoacid residue from which a hydrogen atom on the amino group has been removed; and each R3, independently, is C1-C3alkyl or phenyl and the use thereof for inhibiting (quenching) the effect of anionic fluorescent whitening agents on substrates.