| abstract |
(57) [Summary] [Objective] To provide an excellent novel oral penem compound, its agent and a useful raw material. [Configuration] Formula [Chemical Formula 1] [Wherein R 1 is a hydrogen atom or a lower alkyl group, and R 2 is α Represents an alkyl group or a cyclic alkyl group branched at the position. ], A salt thereof, an agent and (+)-(5R, 6S) -6-[(R) -1 Crystals of -hydroxyethyl] -3- (3-pyridyl) -7-oxo-4-thia-1-azabicyclo [3.2.0] hept-2-ene-2-carboxylate. |