23152-29-6 EINECS 245-462-6 N-((3-Hydroxy-2-pyridinyl)carbonyl)-L-threonyl-D-alpha-aminobutyryl-L-prolyl-N-methyl-L-phenylalanyl-4-oxo-L-pipecoloyl-L-2-phenylglycine rho-lactone N-(3-Hydroxypicolinoyl)-L-threonyl-D-alpha-aminobutyryl-L-prolyl-N-methyl-L-phenylalanyl-4-oxo-L-pipecoloyl-L-2-phenylglycine rho-lactone NSC 177858 Virginiamycin S1 Virginiamycin factor S