[{"from": "human", "value": "Describe this molecule. [C][N][C][=Branch1][#Branch1][=C][N+1][=Branch1][C][=O][O-1][N][C][C][S][C][C][=C][C][=C][Branch1][Ring2][O][Ring1][Branch1][C][N][Branch1][C][C][C]"}, {"from": "gpt", "value": "The molecule is a member of the class of histamine H2-receptor antagonists with antacid activity. Ranitidine is a competitive and reversible inhibitor of the action of histamine, released by enterochromaffin-like (ECL) cells, at the histamine H2-receptors on parietal cells in the stomach, thereby inhibiting the normal and meal-stimulated secretion of stomach acid. In addition, other substances that promote acid secretion have a reduced effect on parietal cells when the H2 receptors are blocked."}]