Synonyms: L-Proline, (4R,5R)-4,5-dihydroxy-N2-[4-(octyloxy)benzoyl]-L-ornithyl-L-threonyl-trans-4-hydroxy-L-prolyl-(S)-4-hydroxy-4-[4-hydroxy-3-(sulfooxy)phenyl]-L-threonyl-3-hydroxy-L-glutaminyl-3-hydroxy-4-methyl-,cyclic (6®1)-peptide, (2a,3b,4b)-; 1H-Dipyrrolo[2,1-c:2',1'-l][1,4,7,10,13,16]hexaazacycloheneicosine,cyclic peptide deriv.; FR 131535