Abstract

The single-crystal X-ray structures of (-)-dimethyl[(2S)-1-(5,6,7,8- tetrahydro-5-oxonaphthalene-2-acetyl)piperidin-2-ylmethyl ]ammonium chloride, C20H29N2O2+.Cl-(BRL-53001A), and (-)-ethylmethyl[(2S)-1-(5,6,7,8-tetrahydro-5-oxonaphthalene- 2- acetyl)piperidin-2-ylmethyl]-ammonium chloride dihydrate, C21H31N2O2+.Cl-.2H2O (BRL-53188A), have been determined. The two molecules have different conformations in the 1-tetralon-6-ylacetyl residue but the same conformation in the 1-acetyl-2-(dialkylaminomethyl)piperidine moiety. The conformations found are in agreement with the required chemical features for kappa affinity and antinociceptive potency.

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