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:

Ultrasonic synthesis, characterization of β-aminoketones by bismuth(III) triflate and determination of antigenotoxic properties. Direct-type catalytic Mannich reaction for the synthesis of β-aminoketones from cyclohexanone, substituted aromatic amines and aromatic or hetero-aromatic aldehydes has been applied in water with bismuth triflate under ultrasound. Good yields of the expected β-aminoketones were obtained from available substrates, at room temperature in 1-2 hours. This study was designed to evaluate the mutagenic and antimutagenic potential of synthesized β-aminoketones compounds using Ames/Salmonella and Escherichia coli WP2 bacterial reverse mutation assay systems.
{"Chemical": ["bismuth(III) triflate", "\u03b2-aminoketone", "bismuth triflate", "cyclohexanone", "aromatic amines and aromatic or hetero-aromatic aldehydes", "\u03b2-aminoketones"]}