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 solar rechargeable flow battery based on photoregeneration of two soluble redox couples. Storable sunshine, reusable rays: A solar rechargeable redox flow battery is proposed based on the photoregeneration of I3 (-) /I(-) and [Fe(C10 H15 )2 ](+) /Fe(C10 H15 )2 soluble redox couples, which can be regenerated by flowing from a discharged redox flow battery (RFB) into a dye-sensitized solar cell (DSSC) and then stored in tanks for subsequent RFB applications This technology enables effective solar-to-chemical energy conversion.
{"Chemical": ["I3 (-)", "Fe(C10 H15 )2", "I(-)", "[Fe(C10 H15 )2 ](+)"]}