Synonyms: 1H,12H-Dipyrrolo[2,1-i:2',1'-r][1,4,7,10,13,16,19,22]oxaheptaazacyclopentacosine,cyclic peptide deriv.; Stereoisomer of N-[N-[1-[N-[N-[1-[N-[N-[1-[N-(1,2-dioxobutyl)-N-methylvalyl]-4-ethylprolyl]-N-methylthreonyl]leucyl]-4-methylprolyl]-5-methylnorleucyl]-N-methylvalyl]prolyl]-N-methylleucyl]glyciney-lactone