Synonyms: 12H-Pyrrolo[2,1-l][1,4,7,10,13,16,19]oxahexaazacyclotetracosine,cyclic peptide deriv.; Antibiotic A 43F; Antibiotic MSD-A 43F; MSD-A 43F; StereoisomerofN-[N-[N2-[1-[N-[N-(5-hydroxy-1-oxotetradecyl)-D-allothreonyl]-D-alanyl]-L-prolyl]-L-glutaminyl]-D-tyrosyl]-L-valinec-lactone