Synonyms: ActinomycinD acid, 9-(x-lactone) (8CI); Actinomycinicacid C1, lactone (7CI); 1H-Pyrrolo[2,1-i][1,4,7,10,13]oxatetraazacyclohexadecine,cyclic peptide deriv.; 3H-Phenoxazine, cyclic peptide deriv.; Actinomycinmonolactone; Stereoisomer ofN-[N-[1-[N-[N-[[2-amino-9-[[[hexadecahydro-2,5,9-trimethyl-6,13-bis(1-methylethyl)-1,4,7,11,14-pentaoxo-1H-pyrrolo[2,1-i][1,4,7,10,13]oxatetraazacyclohexadecin-10-yl]amino]carbonyl]-4,6-dimethyl-3-oxo-3H-phenoxazin-1-yl]carbonyl]-L-threonyl]-D-valyl]-L-prolyl]-N-methylglycyl]-N-methyl-L-valine