Synonyms: 1H,5H-Dipyrrolo[1,2-a:1',2'-p][1,4,7,10,13,16,19,22,25,28]decaazacyclotriacontine,cyclic peptide deriv.; Cyclo(L-leucyl-L-ornithyl-L-valyl-L-prolyl-D-phenylalanyl-L-leucyl-L-ornithyl-L-valyl-L-prolyl-D-phenylalanyl);Cyclo(L-valyl-L-prolyl-D-phenylalanyl-L-leucyl-L-ornithyl-L-valyl-L-prolyl-D-phenylalanyl-L-leucyl-L-ornithyl);Retrogramicidin S