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- [37] SYNTHETIC STUDIES ON OPTICALLY-ACTIVE BETA-LACTAMS .2. ASYMMETRIC-SYNTHESIS OF BETA-LACTAMS BY [2+2]CYCLOCONDENSATION USING HETEROCYCLIC-COMPOUNDS DERIVED FROM L-(+)-TARTARIC ACID, (S)-GLUTAMIC OR (R)-GLUTAMIC ACID, AND (S)-SERINE AS CHIRAL AUXILIARIES CHEMICAL & PHARMACEUTICAL BULLETIN, 1990, 38 (06) : 1601 - 1608