Synonyms: 1-Oxa-4,7,10,13-tetraazacyclohexadecane,cyclic peptide deriv.;D-2-(3,5-Dihydroxyphenyl)-N-[D-2-(3,5-dihydroxyphenyl)-N-[N-[N-[N-[N-(2,3,4,5-tetradehydroprolyl)-L-phenylalanyl]-D-allothreonyl]-D-phenylalanyl]-D-alanyl]glycyl]glycinex-lactone; Glycine,D-2-(3,5-dihydroxyphenyl)-N-[D-2-(3,5-dihydroxyphenyl)-N-[N-[N-[N-[N-(2,3,4,5-tetradehydroprolyl)-L-phenylalanyl]-D-allothreonyl]-D-phenylalanyl]-D-alanyl]glycyl]-,x-lactone