22561-27-9

(6R,7R)-7-[[2-(3-chlorophenyl)acetyl]amino]-3-[(4,4-dimethyl2,3,5,6-te trahydropyrazine-1-carbothioyl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyc lo[4.2.0]oct-2-ene-2-carboxylate