[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is an elemental molecule consisting of two trivalently-bonded nitrogen atoms. It has a role as a member of food packaging gas and a food propellant. It is a diatomic nitrogen, a gas molecular entity and an elemental molecule. It is a conjugate base of a diazynium."}, {"from": "gpt", "value": "[N][#N]"}]