[{"from": "human", "value": "Describe this molecule. [C][C][=C][Branch1][=N][C][Branch1][=Branch1][C][C][C][Ring1][=Branch1][Branch1][C][C][C][/C][=C][/C][=Branch2][Ring2][O][=C][/C][=C][/C][=Branch2][Ring2][Ring1][=C][/C][=C][/C][=C][Branch2][Ring1][#Branch2][/C][=C][/C][=C][Branch2][Ring1][C][/C][=C][/C][=C][Branch1][O][C][C][C][C][Ring1][=Branch1][Branch1][C][C][C][C][\\C][\\C][/C][/C]"}, {"from": "gpt", "value": "The molecule is the most abundant form of carotenoid and it is a precursor of the vitamin A. Beta-carotene is composed of two retinyl groups. It is an antioxidant that can be found in yellow, orange and green leafy vegetables and fruits. Under the FDA, beta-carotene is considered as a generally recognized as safe substance (GRAS)."}]