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:

A new pentacyclic phenol and other constituents from the root bark of Bauhinia racemosa Lamk. This work reported the isolation of one unknown (1) and 10 known compounds (2-11) from the root bark of Bauhinia racemosa Lamk. (family: Caesalpiniaceae). Racemosolone (1) was characterised as a pentacyclic phenolic compound possessing an unusual skeleton with a cycloheptane ring and a rare furopyran moiety. The structure elucidation was carried out on the basis of UV, infrared (IR), HR-ESI-MS, 1D and 2D NMR spectra and finally confirmed by the single crystal X-ray analysis. The known compounds were characterised as n-tetracosane, β-sitosteryl stearate, eicosanoic acid, stigmasterol, β-sitosterol, racemosol, octacosyl ferulate, de-O-methyl racemosol, lupeol and 1,7,8,12b-tetrahydro-2,2,4-trimethyl-2H-benzo[6,7]cyclohepta [1,2,3-de] [1] benzopyran-5,10,11 triol on the basis of spectroscopic data comparison with the literature value. Compounds with skeleton similar to 1 have never been reported from any natural or other source.
{"Chemical": ["eicosanoic acid", "octacosyl ferulate", "furopyran", "pentacyclic phenolic", "stigmasterol", "\u03b2-sitosterol", "Racemosolone", "lupeol", "cycloheptane", "1,7,8,12b-tetrahydro-2,2,4-trimethyl-2H-benzo[6,7]cyclohepta [1,2,3-de] [1] benzopyran-5,10,11 triol", "pentacyclic phenol", "n-tetracosane", "de-O-methyl racemosol", "\u03b2-sitosteryl stearate", "racemosol"]}