You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I need a molecule that meets the following conditions: When heated to decomp it emits toxic fume of nitrogen oxides. Please represent the molecule in SMILES.
user
O=C(O)CN(CCN(CC(=O)O)CC(=O)O)CC(=O)O
assistant