User: I have a question about the chemical with SMILES Nc1nc(=O)[nH]cc1F.
Assistant: That sounds interesting, how can I help?
User: Please provide a description of this drug's mechanism of action.
Assistant: Thymidylate synthase inhibitor
User: I have a question about the {#molecule|chemical|compound!} with {SMILES__description} {SMILES#}.
Assistant: {#Sure, what is your question?|How can I help?|That sounds interesting, how can I help?|Interesting, how can I help?!}
User: {quest#}
Assistant: {#The answer is |!}{answ#}
Nc1nc(=O)[nH]cc1F
Nc1nc(=O)[nH]cc1F
4-amino-5-fluoro-1H-pyrimidin-2-one
Please provide a description of this drug's mechanism of action.