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 anti-inflammatory triterpene saponin isolated from Anabasis setifera. A bio-guided fractionation of Anabasis setifera Moq. (Chenopodiaceae) for anti-inflammatory activity was carried out using carrageenin rat paw edema model in rats. On the basis of percent edema inhibition after 3 h of carrageenin injection, n-butanol fraction showed promising activity through a significant (p < 0.05) decrease in paw volume by 85.6 % from control using indomethacin as reference standard. Moreover, the n-butanol fraction significantly (p < 0.05) decreased PGE2 and TNF-α in the exudates of rat paw edema. Chemical investigation of n-butanol fraction afforded α-amyrin 3-O-glucopyranoside (1), patuletin 7-O-glucopyranoside (2), myricitrin (3) and a new oleanane triterpene saponin derivative (4), sophradiol 3-O-α-L-(1)C4-rhamnopyranosyl-(1'''→4'')-O-β-D-(4)C1-galactopyranosyl (1''→6')-O-β-D-(4)C1-glucopyranoside. The structure of the new compound was determined by comprehensive analyses of their 1D and 2D NMR, mass spectral data and comparison with previously known analogs. Only compound 4 revealed a significant (p < 0.05) inhibition of cyclooxygenase 1 and 2 (COX) activities.
{"Chemical": ["n-butanol", "oleanane triterpene saponin", "sophradiol 3-O-\u03b1-L-(1)C4-rhamnopyranosyl-(1\u0027\u0027\u0027\u21924\u0027\u0027)-O-\u03b2-D-(4)C1-galactopyranosyl (1\u0027\u0027\u21926\u0027)-O-\u03b2-D-(4)C1-glucopyranoside", "myricitrin", "PGE2", "triterpene saponin", "indomethacin", "patuletin 7-O-glucopyranoside", "\u03b1-amyrin 3-O-glucopyranoside"]}