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:

Arundinols A-C and arundinones A and B from the plant endophytic fungus Microsphaeropsis arundinis. Three new ent-eudesmane sesquiterpenoids, arundinols A-C (1-3), one isochroman-1-one, arundinone A (4), and a polyoxygenated benzofuran-3(2H)-one dimer, arundinone B (5), were isolated from the extract of a plant endophytic fungus, Microsphaeropsis arundinis. Their structures were elucidated primarily by NMR experiments, and 1 was confirmed by X-ray crystallography. The absolute configuration of 1 was assigned by X-ray crystallography using Cu Kα radiation, whereas those of the C-11 tertiary alcohols in 2 and 3 were deduced via the circular dichroism data of the in situ formed [Rh(2)(OCOCF(3))(4)] complexes. Arundinone B (5) represents the first dimeric benzofuran-3(2H)-one, showing cytotoxicity against T24 and A549 cells. The co-isolated known compound 6 showed a modest inhibitory effect against Staphylococcus aureus.
{"Chemical": ["Arundinols A-C", "[Rh(2)(OCOCF(3))(4)]", "polyoxygenated benzofuran-3(2H)-one", "arundinone A", "ent-eudesmane sesquiterpenoids", "arundinols A-C", "Rh(2)(OCOCF(3))(4)", "isochroman-1-one", "benzofuran-3(2H)-one", "arundinone B", "Cu", "arundinones A and B", "Arundinone B", "tertiary alcohols"]}