Antibiotic 1754Z3B Glycine, N-[(3-hydroxy-2-pyridinyl)carbonyl]-L-threonyl- D-2-aminobutanoyl-L-prolyl-N-methyl-L-phenylalanyl-4-oxo-L-2-piperidinecarbonyl-L-2-phenyl-, .rho.-lactone N-[(3-Hydroxy-2-pyridinyl)carbonyl]-L-threonyl- D-2-aminobutanoyl-L-prolyl-N-methyl-L-phenylalanyl-4-oxo- L-2-piperidinecarbonyl-L-2-phenylglycine .rho.-lactone NSC177858 Staphylomycin S Staphylomycin S1 VirginiamycinVirginiamycin S1