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L-Prolylglycine2578-57-6100 % similar Proline147-85-349 % similar D-Proline344-25-249 % similar DL-Proline609-36-949 % similar Tiopronin1953-02-246 % similar (2R)-2-Pyrrolidinecarboxamide62937-45-544 % similar L-Prolinamide7531-52-444 % similar (+)-Pipecolic acid1723-00-843 % similar Pipecolic acid3105-95-143 % similar Pipecolic acid4043-87-243 % similar Pipecolic acid535-75-143 % similar L-Methionylglycine14486-03-442 % similar Leucylglycine615-82-742 % similar L-Leucylglycine686-50-042 % similar (S)-Pyrrolidine-2-carboxamide monohydrochloride42429-27-641 % similar Glycylglycine556-50-339 % similar Ethylenediamine-N,N'-disuccinic acid20846-91-738 % similar 2′,6′-Pipecoloxylidide15883-20-238 % similar (2S)-N-(2,6-Dimethylphenyl)-2-piperidinecarboxamide27262-40-438 % similar Ethyl 3-oxo-2-piperazineacetate33422-35-438 % similar