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:

Chemical tagging of a drug target using 5-sulfonyl tetrazole. Irreversible modification is one of the most promising strategies to identify cellular receptors of bioactive small molecules. Here we report that receptor proteins can be chemically tagged using a 5-sulfonyl tetrazole probe. 5-Sulfonyl tetrazole easily accepted nucleophilic attack of thiol groups, while 5-sulfinyl tetrazole did not. These functional groups were introduced into probe molecules of a natural product. Cyclosporine A, an immunosuppressant produced by a microbe, was derivatized to possess 5-sulfonyl tetrazole and a tag group, which enabled chemical tagging of cyclophilin A, the cellular receptor of cyclosporine A. Cyclosporine A derivative possessing 5-sulfinyl tetrazole could not tag cyclophilin A. This technique will allow efficient identification of cellular receptors of bioactive small molecules.
{"Chemical": ["5-Sulfonyl tetrazole", "5-sulfonyl tetrazole", "thiol", "cyclosporine A", "5-sulfinyl tetrazole", "Cyclosporine A"]}