99313-73-2 Cephabacin M(sub 6) L-Valinamide, L-alanyl-L-seryl-L-ornithyl-L-valyl-L-ornithyl-N-(4-((7-((5-amino-5-carboxyl-1-oxopentyl)amino)-2-carboxy-7-methoxy-8-oxo-5-thia-1-azabicyclo(4.2.0)oct-3-en-3-yl)methoxy)-1-(2-amino-2-oxoethyl)-2-hydroxy-4-oxobutyl)-, (6R-(6-alpha,7-alpha,7(R*)))-