Patent ID: 7491728

Claim:
A compound having the chemical formula: wherein: R 1 and R 2 are independently H, halogen, CN, CF 3 , lower alkyl, cycloalk, or aryl; or R 1 and R 2 are together —(CH 2 ) n — and n is 5, 4, or 3; R 3 is aryl, which is optionally substituted by 1 to 4 substitutents on the aryl and each substitutent independently is H, halogen, CN, CF 3 , OCF 3 , lower alkyl, N(lower alkyl) 2 , lower alkoxy, OH, OC(O)-lower alkyl, OC(O)-lower alkylamino or OC(O)-lower alkyl-N(lower alkyl) 2 ; and R 4 is —(CH 2 ) n —R 5 wherein n is 2, and R 5 is aryl, which is optionally substituted by 1 to 3 substitutents on the aryl and each substitutent is independently H, halogen, lower alkyl or lower alkoxy; or a pharmaceutically acceptable salt thereof.