Patent ID: 7148242

Claim:
The compound of formula (I) wherein X is —CH 2 —, —S—, —CH(OH)—, —CH(OR)—, —CH(SH)—, —CH(SR)—, —CF 2 —, —C═N(OR)— or —CH(F)—; R is alkyl; R 1 is heteroaryl or aryl; Each of R 2 , R 3 , R 4 and R 5 is independently hydrogen or alkyl, or (R 2 or R 3 ) and (R 4 or R 5 ) collectively form a C 4-7 cycloalkyl; and n is 0 to 3, provided that when n is 0, X is —CH 2 —; a pharmaceutically acceptable salt thereof or a prodrug thereof.