You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I give you a description of a molecule, and you need to return one molecule in SMILES that meets the description. The description: Lead nitrate decomposes at 470 °c.
user
O=[N+]([O-])[O-].O=[N+]([O-])[O-].[Pb+2]
assistant