butirosin B + 5-oxo-L-proline => gamma-L-glutamyl-butirosin B
butirosin b + 5-oxo-l-proline => gamma-l-glutamyl-butirosin b
butirosin B + 5-oxo-L-proline => gamma-L-glutamyl-butirosin B
butirosin b + 5-oxo-l-proline => gamma-l-glutamyl-butirosin b