Synonyms: Didemnin A,N-[1-(2-hydroxy-1-oxopropyl)-L-prolyl]-3-[(3S,4R)-3-hydroxy-5-methyl-4-aminohexanoicacid]-, (S)-; 15H-Pyrrolo[2,1-f][1,15,4,7,10,20]dioxatetraazacyclotricosine,cyclic peptide deriv.; L-Tyrosine,(2S)-2-hydroxypropanoyl-L-prolyl-N-methyl-D-leucyl-L-threonyl-(3S,4R)-4-amino-3-hydroxy-5-methylhexanoyl-(2S,4S)-4-hydroxy-2,5-dimethyl-3-oxohexanoyl-L-leucyl-L-prolyl-N,O-dimethyl-,(9®4)-lactone