Diamino sulfanilide (dasa) diamino diphenylamine, sulphonic acid, diamino benzanilide(daba), vinyl sulphone, ester of acetanilide (para base vs), diamino diphenyl 2, 2' disulfonic acid (bdsa), vinyl sulphone ester of ortho anisidine base (oavs), p-amino phenyl azo salicylic acid ( papas acid), orthonitrotoluene parasulphonic acid (ontpsa).
