FIELD: organic synthesis. SUBSTANCE: invention provides novel compounds of the 4,4'-diaminostilbene-2,2'-disulfonic acid series, which can be used as fluorescent bleaching agents. Invention describes compounds of formula I, structure and radicals of which are divulged in claim 1, wherein known compounds of formula 1 are omitted. Invention also describes: method of fluorescent bleaching of a substrate, method for enhancing solar- control properties of textile material, detergent composition for fluorescent bleaching of textiles, and textile color-preserving detergent. EFFECT: strengthened fluorescent properties favoring use of compounds for inhibiting effect of anionic fluorescent bleaching agents on substrates. 15 cl, 2 tbl, 19 ex
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