(D-Ser2)-Leu-Enkephalin-Thr 是阿片受体的 delta 选择性药物，具有镇痛作用。

(D-Ser2)-Leu-Enkephalin-Thr is a delta selective agent of opioid receptor and shows analgesic effects.

(< 1 mg/ml refers to the product slightly soluble or insoluble )
Powder: -20°C for 3 years
In solvent: -80°C for 2 years