User: I have a question about the chemical with SMILES O=C(O)c1cc2ccccc2c(Cc2c(O)c(C(=O)O)cc3ccccc23)c1O.OCCOCCN1CCN(C(c2ccccc2)c2ccc(Cl)cc2)CC1.
Assistant: Interesting, how can I help?
User: Please provide a description of this drug's mechanism of action.
Assistant: The answer is Histamine H1 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#}
O=C(O)c1cc2ccccc2c(Cc2c(O)c(C(=O)O)cc3ccccc23)c1O.OCCOCCN1CCN(C(c2ccccc2)c2ccc(Cl)cc2)CC1
O=C(O)c1cc2ccccc2c(Cc2c(O)c(C(=O)O)cc3ccccc23)c1O.OCCOCCN1CCN(C(c2ccccc2)c2ccc(Cl)cc2)CC1
4-[(3-carboxy-2-hydroxynaphthalen-1-yl)methyl]-3-hydroxynaphthalene-2-carboxylic acid;2-[2-[4-[(4-chlorophenyl)-phenylmethyl]piperazin-1-yl]ethoxy]ethanol
Please provide a description of this drug's mechanism of action.