[{"from": "human", "value": "Provide a description of this molecule. [C][=C][Branch1][=C][N][=C][Branch1][Ring2][S][Ring1][Branch1][N][=C][Branch1][C][N][N][C][S][C][C][C][=Branch1][#Branch2][=N][S][=Branch1][C][=O][=Branch1][C][=O][N][N]"}, {"from": "gpt", "value": "The molecule is a propanimidamide and histamine H2-receptor antagonist with antacid activity. As a competitive inhibitor of histamine H2-receptors located on the basolateral membrane of the parietal cell, famotidine reduces basal and nocturnal gastric acid secretion, resulting in a reduction in gastric volume, acidity, and amount of gastric acid released in response to various stimuli."}]