Task: Answer the following question about the molecule with SMILES O=C(O)/C=C/C(=O)O.OCCOCCN1CCN(C2=Nc3ccccc3Sc3ccccc32)CC1.OCCOCCN1CCN(C2=Nc3ccccc3Sc3ccccc32)CC1.
Description: Please provide a description of this drug's mechanism of action.
Answer: Serotonin 2a (5-HT2a) receptor antagonist
Task: Answer the following question about the molecule with {SMILES__description} {SMILES#}.
{#Description|Question|Request!}: {quest#}
{#Result|Answer|Completion!}: {answ#}
O=C(O)/C=C/C(=O)O.OCCOCCN1CCN(C2=Nc3ccccc3Sc3ccccc32)CC1.OCCOCCN1CCN(C2=Nc3ccccc3Sc3ccccc32)CC1
O=C(O)/C=C/C(=O)O.OCCOCCN1CCN(C2=Nc3ccccc3Sc3ccccc32)CC1.OCCOCCN1CCN(C2=Nc3ccccc3Sc3ccccc32)CC1
2-[2-(4-benzo[b][1,4]benzothiazepin-6-ylpiperazin-1-yl)ethoxy]ethanol;(E)-but-2-enedioic acid
Please provide a description of this drug's mechanism of action.