You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
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Based on the given information, generate a molecule that meets the desired specifications: The molecule is a anti allergic agent, h1-receptor antagonist, sedative and belongs to the pharmaceutical, anti emetic, cholinergic antagonist classes of molecules. When heated to decomposition it emits acrid smoke & fumes. The molecule is a anti tussive with a Odorless. The molecule is a histamine antagonist and belongs to the drug class of molecules with a Tasteless.
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