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:

Green asymmetric synthesis: β-amino alcohol-catalyzed direct asymmetric aldol reactions in aqueous micelles. The ability of chiral β-amino alcohols to catalyze the direct asymmetric aldol reaction was evaluated for the first time in aqueous micellar media. A family of cheap and easily accessible β-amino alcohols, obtained in one step from naturally occurring amino acids, was shown to successfully catalyze the asymmetric aldol reaction between a series of ketones and aromatic aldehydes. These aldol reactions furnished the corresponding β-hydroxy ketones with up to 93% isolated yield and 89% ee. (S)-2-phenylglycinol and Triton X-100 proved to be the best organocatalyst and surfactant, respectively.
{"Chemical": ["amino acids", "ketones", "aromatic aldehydes", "aldol", "\u03b2-amino alcohol", "chiral \u03b2-amino alcohols", "\u03b2-amino alcohols", "\u03b2-hydroxy ketones", "(S)-2-phenylglycinol", "Triton X-100"]}