6α-[[(R)-Amino(1,4-cyclohexadien-1-yl)acetyl]amino]penicillanic acid sodium salt

sodium [2S-[2alpha,5alpha,6beta(S*)]]-6-[(aminocyclohexa-1,4-dien-1-ylacetyl)amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate