99313-74-3 Cephabacin M(sub 4) L-Valinamide, N-(4-((7-((5-amino-5-carboxy-1-oxopentyl)amino)-2-carboxy-7-methoxy-8-oxo-5-thia-1-azabicyclo(4.2.0)oct-2-en-3-yl)methoxy)-1-(2-amino-2-oxoethyl)-2-hydroxy-4-oxobutyl)-L-ornithyl-L-valyl-L-ornithyl-, (6R-(6-alpha,7-alpha,7(R*)))-