[{"from": "human", "value": "Please give me some details about this molecule. [C][C][=C][O][C][=C][C][=C][C][=C][Ring1][=Branch1][Ring1][#Branch2]"}, {"from": "gpt", "value": "The molecule is a simplest member of the class of chromene in which the heterocyclic pyran ring has a double bond between positions 2 and 3. It is a chromene and an organic heterobicyclic compound. It is a tautomer of a 2H-chromene."}]