6-(1-pyrrolidinyl)-N-(1H-tetrazol-5-yl)-2-pyrazine-5-carboxamide
6-Phenoxy-pyrazine-2-carboxylic acid (1H-tetrazol-5-yl)-amide
6-Cyclohexylamino-pyrazine-2-carboxylic acid (1H-tetrazol-5-yl)-amide
6-(dimethylamino)-N-(1H-5-tetrazolyl)pyrazine-2-carboxamide
6-(2-Amino-ethylamino)-pyrazine-2-carboxylic acid (1H-tetrazol-5-yl)-amide; hydrochloride