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: It belongs to the serotonin antagonist class of molecules. Please write the SMILES representation of it.
user
Cl.Cl.Fc1ccc(C(=C2CCN(CCCN3CCN(c4nccc5ccccc45)CC3)CC2)c2ccc(F)cc2)cc1
assistant