Synonyms: 15H-Pyrrolo[2,1-f][1,15,4,7,10,20]dioxatetraazacyclotricosine,cyclic peptide deriv.; L-Tyrosine, N-[1-[N-[4-[[3-hydroxy-5-methyl-4-[[N-(N-methyl-D-leucyl)-L-threonyl]amino]-1-oxoheptyl]oxy]-2,5-dimethyl-1,3-dioxohexyl]-L-leucyl]-L-prolyl]-N,O-dimethyl-,j-lactone,[3S-[1(2R*,4R*),3R*,4S*,5R*]]-; NSC 351910;[3S-[1(2R*,4R*),3R*,4S*,5R*]]-N-[1-[N-[4-[[3-Hydroxy-5-methyl-4-[[N-(N-methyl-D-leucyl)-L-threonyl]amino]-1-oxoheptyl]oxy]-2,5-dimethyl-1,3-dioxohexyl]-L-leucyl]-L-prolyl]-N,O-dimethyl-L-tyrosinej-lactone