Lactamase of 1-amino-3-carboxylic acid cyclic compounds are provided in enantiomeric form, together with an enantiomer of the corresponding ring-opened amino-acid or ester, by reaction of the racemic lactam with a novel lactamase. The products are useful in the synthesis of chiral carbocyclic nucleotides.  
                            通过外消旋内酰胺与新型内酰胺酶的反应,提供对映体形式的 1-
氨基-3-
羧酸环状化合物的内酰胺酶,以及相应的开环
氨基酸或酯的对映体。这些产品可用于合成手性碳环核苷酸。