.beta.-Lactam antibiotics and compositions containing the same
.beta.-Lactam antibiotics and their medicinal use
.beta.-Lactam antibiotics and their use
.beta.-Lactam antibiotics and their use
.beta.-Lactam antibiotics, a process for their prepaeration and
.beta.-Lactam antibiotics, a process for their preparation and t
.beta.-Lactam antibiotics, preparation and use
.beta.-Lactam antibiotics, their preparation and use
.beta.-Lactam antibiotics, their preparation and use
.beta.-lactam compound and a pharmaceutical composition containi
.beta.-lactam compounds
.beta.-lactam compounds
.beta.-lactam compounds
.beta.-Lactam compounds
.beta.-lactam compounds and their production
.beta.-Lactam compounds, and use
.beta.-Lactam compounds, antibacterial compositions thereof and
.beta.-Lactam compounds, their preparation and use
.beta.-Lactam containing compounds, their preparation and use
.beta.-Lactam containing compounds, their preparation and use