Patent ID: 8143375

Claim:
A compound of formula (Ia): wherein n=0 or 1, and R 1 , R 2 , R 3 , R 4 and R 5 are independently selected from H; lower alkyl; aryl; heteroaryl; alkenyl; cycloalkyl; heterocycle; esters of the formula —C(O)OR* wherein R* is selected from alkyl and aryl; amides of the formula —C(O)NR**R***, wherein R** and R*** are independently selected from alkyl and aryl; —CH 2 C(O)R, wherein R is selected from —OH, lower alkyl, aryl, -loweralkyl-aryl, or —NR a R b , where R a and R b are independently selected from H, lower alkyl, aryl or -loweralkyl-aryl; —C(O)R c , wherein R c is selected from lower alkyl, aryl or -loweralkyl-aryl; or -lower alkyl-OR d , wherein R d is a suitable protecting group; all of which are optionally substituted at one or more substitutable positions with one or more suitable substituents, with the proviso that when R 2 is phenyl, R 3 is methyl, and n=0 then R 1 cannot be —C(O)NEt 2 .