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: The molecule is a waste product and belongs to both the pharmaceutical and drug metabolite classes of molecules.
user
O=c1nc2[nH][nH]cc-2c(=O)[nH]1
assistant