You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Brand", "UnapprovedDrug", "Drug", "DrugGroup"].

Please return the output as a JSON object of the format: {"Brand" : ["Aspirin", ...], "DrugGroup": ["Salicyclate", ...], "Drug": ["Phenobarbital", ...], "UnapprovedDrug": ["Heroin", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Ethopropazine may interact with alcohol or other CNS depressants, causing increased sedative effects. It may also interact with amantadine or other anticholinergic drugs or MAOIs, which may intensify the anticholinergic action. Ethopropazine can interact with chlorpromazine, increasing the metabolism of chlorpromazine.
{"Brand": [], "Drug": ["Ethopropazine", "alcohol", "chlorpromazine", "amantadine"], "DrugGroup": ["MAOIs", "anticholinergic drugs", "CNS depressants"], "UnapprovedDrug": []}