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:

Two new tri-nor-eudesmanolides from Inula racemosa. Two new tri-nor-eudesmane-type sesquiterpenoids were isolated from the roots of Inula racemosa, and their structures were elucidated as 8-oxo-tri-nor-eudesm-6-en-5α-ol (1) and tri-nor-eudesm-5-en-7β,8β-diol (2). The cytotoxic activity of compound 1 against five human cancer cell lines had been tested, but exhibited no cytotoxic activity.
{"Chemical": ["tri-nor-eudesm-5-en-7\u03b2,8\u03b2-diol", "tri-nor-eudesmanolides", "sesquiterpenoids", "tri-nor-eudesmane", "8-oxo-tri-nor-eudesm-6-en-5\u03b1-ol"]}