| 摘要 |
<p>" Vat dyestuffs of the formula wherein X represents a nitrogen-containing heterocyclic radical which is bonded through a carbon atom, R1 and R2 each represent a hydrogen atom or a low molecular alkyl radical, and A1 and A2 represent a different or similar vattable radical with 3 to 6 condensed rings, are suitable for dyeing and printing the most varied materials, in particular for dyeing und printing fibres made from natural or regenerated cellulose in the presence of reducing agents."</p> |
