3-dimethyl-7-oxo-hyridin-3-yl)carbonyl)amino)phenylacetyl)amino)-(2s-(2-al

4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylicacid,6-(((((4-hydroxy-1,5-napht

(6R)-6-((R)-2-(4-Hydroxy-1,5-naphthyridin-3-carboxamido)-2-phenylacetamido)penicillansaeure

6α-[(R)-2-[(4-Hydroxy-1,5-naphthyridin-3-yl)carbonylamino]-2-phenylacetylamino]penicillanic acid