Patent ID: 8513430

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof: wherein R 1 is 5-hydroxy-adamantan-2-yl; R 2 is aryl, heteroaryl, —C 1-4 alkylene-aryl, or —C 1-4 alkylene-heteroaryl, where the aryl and heteroaryl groups are optionally substituted one or more times with substituents selected independently from the group consisting of halogen, C 1-4 alkyl, —O—C 1-4 alkyl, —CF 3 , —CH 2 CF 3 , —CF 2 CF 3 , and —OCF 3 ; A 1 is and R 3 and R 4 are each independently selected from the group consisting of hydrogen, halogen, C 1-4 alkyl, —O—C 1-4 alkyl, —CF 3 , —CH 2 CF 3 , —CF 2 CF 3 , and —OCF 3 .