| 摘要 |
Dyestuffs of the formula <IMAGE> (I) wherein Z denotes a radical to complete a 3,4- or 2,3-pyridinylene, a 4,5-pyrimidinylene, a 3,4- or 4,5-pyridazinylene or a 2,3-pyrazinylene system and X, Y, m and n have the meanings given in the description, which are particularly suitable for bulk dyeing plastics, in particular thermoplastics, have been found.
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