| 摘要 |
A compound of Formula (1) or salt thereof: <IMAGE> (I) wherein: R1 is H, C1-4-alkyl, C1-4-alkoxy, CO2H, SO3H or -NR3R4; R2 is H, C1-4-alkyl, C1-4-alkoxy, CO2H or SO3H; R3 and R4 are each independently H, C1-18-alkyl or R3 and R4, together with the nitrogen atom to which they are attached, form an optionally substituted 5- or 6-membered ring; W is -OH and X is -NH2, or W is -NH2 and X is -OH; and Y and Z are each independently -OH or -NR3R4. The compound is suitable for use as a black component of ink jet printing inks.
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