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: ["Chemical"].

Please return the output as a JSON object of the format: {"Chemical": ["Arsenic", ...]}. 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:

2-Amino-4-arylthiazole compounds as TRPA1 antagonists (WO 2012085662): a patent evaluation. The patent claims 2-amino-4-arylthiazole derivative compounds as inhibitors of the TRPA1 (transient receptor potential ankyrin, member 1) receptor. These compounds are potent antagonists on the basis of the results of in vitro assays, and are expected to be useful for treating conditions and disorders associated with TRPA1 function such as pain, chronic pain, neuropathic pain, rheumatoid arthritic pain, osteoarthritic pain, diabetic neuropathy and inflammatory disorders.
{"Chemical": ["2-amino-4-arylthiazole", "2-Amino-4-arylthiazole"]}