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- [24] OPIATE-LIKE PEPTIDES .12. SYNTHESIS AND SOME BIOLOGICAL PROPERTIES OF MET-ENKEPHALIN ANALOGS MODIFIED IN POSITION-2 BY D-ALANYL RESIDUE IN POSITION 2 AND POSITION-4 BY 3-(2-NAPHTHYL)-D-ALANYL RESIDUE POLISH JOURNAL OF PHARMACOLOGY AND PHARMACY, 1989, 41 (02): : 147 - 156