[{"from": "human", "value": "What can you tell me about this molecule? [C][C@H1][Branch1][N][/C][=C][/C@H1][Branch1][C][C][C][Branch1][C][C][C][C@H1][C][C][C@@H1][C@@][Ring1][Branch1][Branch2][Ring1][Branch1][C][C][C][/C][\\-Ring1][=Branch1][=C][\\C][=C][\\C][C@H1][Branch1][#Branch1][C][C][C][/-Ring1][=Branch1][=C][O][C]"}, {"from": "gpt", "value": "The molecule is vitamin D2, a fat-soluble vitamin important for many biochemical processes including the absorption and metabolism of calcium and phosphorus.  In vivo, ergocalciferol is formed after sun (ultraviolet) irradiation of plant-derived ergosterol, another form of vitamin D. Ergocalciferol is the form of vitamin D usually found in vitamin supplements. (NCI04)"}]