Patent Number: 7,612,226

Title: Amino acid derivatives

Abstract: The present invention relates to a method of treating pain using a compound of formula ##STR00001## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are as defined herein. The invention also relates to certain novel derivatives of formula (I).

Inventors: Graham; Shelley Rene (Ann Arbor, MI), Mantell; Simon John (Sandwich, GB), Rawson; David James (Sandwich, GB), Schwarz; Jacob Bradely (Ann Arbor, MI)

Assignee: Pfizer Inc.

International Classification: C07C 261/00 (20060101)

Expiration Date: 1/03/02017