Question: Please describe this drug.
 The Molecule can be represented with the SMILES CN1CCC(=C2c3ccccc3CC(=O)c3sccc32)CC1.
Result: Ketotifen is a cycloheptathiophene derivative with anti-allergic activity. Ketotifen selectively blocks histamine (H1) receptors and prevents the typical symptoms caused by histamine release. This agent also interferes with the release of inflammatory mediators from mast cells involved in hypersensitivity reactions, thereby decreasing chemotaxis and activation of eosinophils.
{#Question|Q!}: {quest#}
{#Constraint:|Description:|!} The {#Molecule|Compound|Chemical!} {#has the|can be represented with the!} {SMILES__description} {SMILES#}.
{#Answer|Result|Answer!}: {answ#}
CN1CCC(=C2c3ccccc3CC(=O)c3sccc32)CC1
CN1CCC(=C2C3=C(C(=O)CC4=CC=CC=C42)SC=C3)CC1
2-(1-methylpiperidin-4-ylidene)-6-thiatricyclo[8.4.0.03,7]tetradeca-1(14),3(7),4,10,12-pentaen-8-one
Please describe this drug.