1. The direct carbamoylation of [1-glycine]angiotensin has given a highly active analog of the natural hormone−[1-hydantoic acid]angiotensin.
2. The synthesis of [1-hydantoic acid]angiotensin labeled with the14C isotope in position 1 has been effected by the proposed method.
3. A copolymer of polysuccinyllysine and [1-glycine]angiotensin has been synthesized.