Patent ID: 8735385

Claim:
A compound of formula (Ia): wherein: l is 0 or 1; m and p independently of each other are; n is 0, 1 or 2; s is 0 or 1; X is O, NR 5 or CHR 6 ; R 1 is hydrogen, (C 1 -C 4 )alkyl or CF 3 ; R 2 is hydrogen, halogen, (C 1 -C 4 )alkyl, (C 1 -C 4 )alkoxy or CF 3 ; R 5 is hydrogen, (C 1 -C 4 )alkyl or tert-butyloxycarbonyl (t-BOC); and R 6 is hydrogen, OH or COOR; and wherein R is hydrogen or (C 1 -C 4 )alkyl; or a salt thereof or an enantiomer or a diastereomer thereof.