[{"from": "human", "value": "Describe this molecule. [C][=Branch1][C][=O][Branch1][C][O-1][O-1].[Ca+2]"}, {"from": "gpt", "value": "The molecule is the carbonic salt of calcium (CaCO3). Calcium carbonate is used therapeutically as a phosphate buffer in hemodialysis, as an antacid in gastric hyperacidity for temporary relief of indigestion and heartburn, and as a calcium supplement for preventing and treating osteoporosis. (NCI04)"}]