3-(Thiazol-2-ylcarbamoyl)-acrylic acid

2-(4-Hydroxy-phenyl)-4-methyl-thiazole-5-carboxylic acid

2-Phenyl-benzooxazole-5-carboxylic acid

(5-Chloro-benzothiazol-2-ylsulfanyl)-acetic acid

4-(5-Amino-1,3-dioxo-1,3-dihydro-isoindol-2-yl)-butyric acid

5-(4-Ethyl-phenyl)-7-trifluoromethyl-pyrazolo[1,5- a ]pyrimidine-2-carboxylic 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