Patent ID: 7759346

Claim:
A pharmaceutical composition comprising: a) an effective amount of at least one compound of formula (I): wherein: R 1 is hydrogen, alkyl of 1 to 6 carbon atoms or phenylalkyl of 7 to 12 carbon atoms; R 2 is hydrogen, alkyl of 1 to 6 carbon atoms, alkenyl of 2 to 6 carbon atoms or phenylalkyl of 7 to 12 carbon atoms; or R 1 and R 2 taken together as Z are —CH 2 CH 2 —, —CH 2 C(R 6 )(R 7 )CH 2 — or —CH 2 C(R 8 )(R 9 )—C(R 10 )(R 11 )CH 2 —, where R 6 , R 8 and R 10 are, independently, hydrogen, alkyl of 1 to 6 carbon atoms or hydroxyl and R 7 , R 9 and R 11 are, independently, hydrogen or alkyl of 1 to 6 carbon atoms; A is alkylene of 1 to 6 carbon atoms or alkenylene of 2 to 6 carbon atoms; X is CO 2 R 3 , P(O)(OR 4 )(OR 5 ), 3,5-dioxo-1,2,4-oxadiazolidin-2-yl or 5-tetrazolyl wherein R 3 , R 4 and R 5 are, independently, hydrogen or alkyl of 1 to 6 carbon atoms; or a pharmaceutically acceptable salt thereof; and b) a pharmaceutically effective amount of at least one pain relieving agent.