H. Schmidhammer et al., SYNTHESIS AND BIOLOGICAL EVALUATION OF 14-ALKOXYMORPHINANS .14. 14-ETHOXY-9-METHYL SUBSTITUTED INDOLOMORPHINANS WITH DELTA-OPIOID RECEPTOR SELECTIVITY, Bioorganic & medicinal chemistry letters, 7(2), 1997, pp. 151-156
The 5-methyl and 14-ethoxy substituted analogues (compounds 2-4) of th
e delta opioid receptor antagonist naltrindole showed similar selectiv
ity when compared with the reference drug. Compound 2 was a delta rece
ptor antagonist in the mouse vas deferens preparation (MVD) exhibiting
considerably higher selectivity ratios than naltrindole, while compou
nd 4 was found to be a full and potent delta receptor agonist in the M
VD. (C) 1997, Elsevier Science Ltd.