C[C@H]1[C@H](C(=N[C@H]1[C@@H]([C@@H](C)O)C(=O)O)C(=O)O)S[C@H]2C[C@@H](NC2)C(=O)N(C)C MER (1R,5S,6S)-2-[(3S,5S)-5-DIMETHYLAMINOCARBONYLPYRROLIDIN-3-YLTHIO]-6-[(R)-1-HYDROXYETHYL]-1-METHYLCARBAPEN-2-EM-3-CARBOXYLIC ACID