[{"from": "human", "value": "What can you tell me about this molecule? [C][C][=Branch1][C][=C][C][=C]"}, {"from": "gpt", "value": "The molecule is an unsaturated pentahydrocarbon, Isoprene is found in certain plants or obtained by distillation of caoutchouc or gutta-percha. In plants, it is elementary in the formation of isoprenoids, fat-soluble vitamins, carotenoids and related pigments. Isoprenes contribute to flavors and fragrances of essential oils and other plant-derived substances. (NCI04)"}]