| 摘要 |
<p>This invention encompasses compounds of the formula <IMAGE> (I) wherein R1 and R2 independently are hydrogen, C1-4 alkyl, or C2-4 hydroxyalkyl; one of R3 to R7 is -SO3H or -COOH; and the remaining of R3 to R7 independently are hydrogen, chlorine, C1-4 alkyl, C1-4 alkoxy, or -NR8R9, where R8 and R9 independently are hydrogen, C1-4 alkyl, C2-4 alkoxy, or where -NR8R9 is piperidine, morpholine, piperazine, or pyrrolidone; or a water soluble salt thereof; hair dye preparation containing these compounds, and methods for dyeing hair using such preparation.</p> |
