User: I have a question about the chemical with SMILES CN1CC2CCN(c3ccc(-c4ccc(-n5ncccc5=O)cc4)cc3)C2C1.
Assistant: Interesting, how can I help?
User: Please provide a description of this drug's mechanism of action.
Assistant: Histamine H3 receptor antagonist
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#}
CN1CC2CCN(c3ccc(-c4ccc(-n5ncccc5=O)cc4)cc3)C2C1
CN1CC2CCN(c3ccc(-c4ccc(-n5ncccc5=O)cc4)cc3)C2C1
2-[4-[4-(5-methyl-2,3,3a,4,6,6a-hexahydropyrrolo[2,3-c]pyrrol-1-yl)phenyl]phenyl]pyridazin-3-one
Please provide a description of this drug's mechanism of action.