(2-Oxo-pyrrolidines)-acetic hydrazides

(2-Oxo-pyrrolidines)-acetic hydrazides

(4'-Biphenylyloxy and-thio-oxy)-3-hydroxy-3-pyrroline-2,5-diones

(Carboxy-oxo-pyrrolidino)phenylalkenamides and esters thereof as

(R,S)-1-(3-Hydroxy-4-methoxybenzoyl)-3-hydroxy-2-pyrrolidinone i

-4-Phenylhexahydro-4-indolinol derivatives

.beta.-Lactam antibacterial agents

.beta.-Lactam antibacterial agents

.beta.-Lactam antibacterial agents, a process for the preparatio

.beta.-Lactam antibacterial compounds, their preparation and pha

.beta.-Lactam antibiotic, its preparation and 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 compounds, their preparation and use

.beta.-Lactam containing compounds, their preparation and use

.beta.-Lactam containing compounds, their preparation and use

.DELTA..sup.3 -Thienamycin

1'-Substituted-spiro[pyrrolidine-3,3'-indoline]-2,2',5-triones