4-(hydroxymethylphosphinyl)-l-2-aminobutanoyl-l-alanyl-l-alanin antibioticsf1293 γ- -D-α-aminobutyryl-L-alanyl-L-alanine γ- -L-α-aminobutyryl-L-alanyl-L-alanine bilanafos gamma-(hydroxymethylphosphinyl)-l-alpha-aminobutyryl-l-alanyl-l-alanin gamma-(hydroxymethylphosphinyl)-l-alpha-aminobutyryl-l-alanyl-l-alanine BIALOPHOS