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US6011141A Acid polyazo dyes 失效
酸性多偶氮染料

Acid polyazo dyes
摘要:
Polyazo dyes of the formula ##STR1## where n, Y.sup.1, Y.sup.2, Y.sup.3, Y.sup.4, X, R.sup.1, R.sup.2 and R.sup.3 are each as defined in more detail in the description are useful for dyeing natural or synthetic substrates.
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