6-[2-(1,1-Dioxopenicillanoyloxymethoxycarbonyl)-2-phenylacetamido]penicillanic acid, 6-[2-(1,1-dioxopenicil- lanoyloxymethoxycarbonyl)-2-(3-thienyl)acetamido]-penicillanic acid and salts thereof with pharmaceutically acceptabie bases; their use as antibacterial agents; processes and intermediates for their preparation,
6-[2-(1,1-二氧代苯甲酰氧基甲氧基羰基)-2-苯乙酰胺基]青霉烷酸、6-[2-(1,1-二氧代苯甲酰氧基甲氧基羰基)-2-(3-
噻吩基)乙酰胺基]-青霉烷酸及其与药学上可接受的碱的盐类;它们作为抗菌剂的用途;制备它们的工艺和中间体、