A process for the preparation of a carbapenem antibacterial compound of the following formula (4) having a 1-alkylpyrrolidine structure or a salt thereof, a useful synthetic intermediate of the following formula (1) or a salt thereof, and a process for the preparation thereof: ##STR1##

wherein R1 represents a C1-C3 alkyl group, R2 and R3 each independently represents a hydrogen atom or an organic residue or R2 and R3 together with the nitrogen atom they are attached to form a ring.

 
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