abstract |
4-Amino-2-nitro-diphenylamine cpds. of formula (I) and their water-soluble salts are new. R1 and R2 = H, 1-4C alkyl or 2-4C hydroxyalkyl; one of R3-R7 = SO3H or COOH, and the others are H, Cl, 1-4C alkyl or alkoxy, or NR8R9; R8 and R9 = H, 1-4C alkyl or 2-4C hydroxyalkyl, or together complete piperidino, morpholino, piperazino or pyrrolidino. |