[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is one of a pair of phellandrene cyclic monoterpene double-bond isomers in which one double bond is exocyclic (cf. alpha-phellandrene, where both of them are endoocyclic). It has a role as a plant metabolite."}, {"from": "gpt", "value": "[C][C][Branch1][C][C][C][C][C][C][=Branch1][C][=C][C][=C][Ring1][#Branch1]"}]