4 Amino Acetanilide 3 Sulphonic Acid ( 4AASA) Product Name : 4 Amino Acetanilide 3 Sulphonic Acid ( 4AASA) ( CAS No. 96 - 78 - 6) Synonyms: 5 Acetamido 2 Aminobenzene Sulphonic Acid CAS no. : 96 - 78 – 6 EINECS No.: 202-534-1 Applications: Intermediate for Optical Brightening Agents. CAS no. : 96-78-6