| 摘要 |
(Pyrazolinylphenylsulfonyl)-piperazines of the formula <IMAGE> wherein R1 is unsubstituted or substituted alkyl, aralkyl or alkenyl, R2 is unsubstituted or substituted alkyl, aryl or aralkyl R3, R4, R5, R6, R7 and R8 are certain substituents and Y is an anion, their preparation as well as their use as optical brighteners are disclosed.
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