e, potassium peracrylyl or methacrylyl group on the N nitrogen atom of the sulfanilyl group and a hydrocarbon group such as alkyl or phenyl on the Il -nitrogen atom of the sulfanilyl group that such compounds are not only valuable as biological and thera- 3o acid (Caros acid). peutic chemicals and as chemical intermediates, but more especially are capable of forming valuable homopolymers and copol