[NH:1]1[C:5](=[O:6])[CH2:4][CH2:3][C@H:2]1[C:7]([O-:9])=[O:8].[Na+:10].N1C(=[O:16])CC[C@@H]1C([O-])=O.[Na+]>>[OH2:6].[OH2:16].[OH2:6].[NH:1]1[C:5](=[O:6])[CH2:4][CH2:3][C@H:2]1[C:7]([O-:9])=[O:8].[Na+:10]A mixture of 85 mole % sodium L-pyroglutamate and 15 mole % sodium D-pyroglutamate crystallized in a manner analogous to Example 6. 12% of theory sodium L-pyroglutamate trihydrate was obtained at a concentration of 60% in the solution during cooling to -10° C.
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