You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Suppose there is a molecule that meets the following description: The molecule has Smells of ammmonia. When heated to decomposition it emits toxic fumes of ammonia. Please write the SMILES representation of it.
user
O=[Cr](=O)([O-])[O-].[NH4+].[NH4+]
assistant