[3H][D-Ser2(O-tert-butyl),Leu5]enkephalyl-Thr6 and [D-Ser2(O-tert-butyl),Leu5]enkephalyl-Thr6(O-tert-butyl). Two new enkephalin analogs with both a good selectivity and a high affinity toward delta-opioid binding sites.

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