abstract |
ABSTRACT OF THE DISCLOSURE This invention provides a penam derivative represented by the formula (I) wherein R is hydrogen or methyl and R1 is (hexahydro-1H-azepon-1-yl)methyleneamino, 2-phenylacetamido, 2-phenoxyacetamido, 2-amino-2-phenylacetamido, 2-amino-2-(p-hydroxyphenyl)acetamido or 2-(4-ethyl-2,3-dioxo-1-piperazine)carboxamido-2-phenylacetamido, and a pharmaceutically acceptable salt thereof, and processes for preparing them. |