3- tert -Butoxycarbonylamino-3-(3,4-dimethoxy-phenyl)-propionic acid

5,7-Bis-(2-methyl-2 H -pyrazol-3-yl)-pyrazolo[1,5- a ]pyrimidine-2-carboxylic acid

6-Cyclopropyl-1,3-dimethyl-1 H -pyrazolo[3,4- b ]pyridine-4-carboxylic acid

4-Amino-2-methyl-2 H -pyrazole-3-carboxylic acid

5-Phenyl-7-trifluoromethyl-4,5,6,7-tetrahydro-pyrazolo[1,5- a ]pyrimidine-2-carboxylic acid

(3-Cyclopropyl-5-difluoromethyl-pyrazol-1-yl)-acetic acid

5-Diethylaminomethyl-furan-2-carboxylic acid

5-(4-Chloro-phenyl)-4-methyl-thiophene-2-carboxylic acid

1-(4-Chloro-benzenesulfonyl)-piperidine-3-carboxylic acid

1-(1,3-Dimethyl-1 H -pyrazole-4-sulfonyl)-piperidine-3-carboxylic acid

2-(1-Ethyl-1 H -pyrazol-4-yl)-quinoline-4-carboxylic acid