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:

Electronic and EPR spectra of the species involved in [W10O32]4- photocatalysis. A relativistic DFT investigation. The decatungstate anion [W(10)O(32)](4-) is widely used as a photocatalyst in different transformations, during which it undergoes one-electron reduction to [W(10)O(32)](5-), possibly protonated; the bi-reduced species [W(10)O(32)](6-) is obtained by ensuing disproportionation. Relativistic DFT calculations were used to predict the UV-VIS spectra and EPR parameters of all such species.
{"Chemical": ["[W(10)O(32)](4-)", "[W(10)O(32)](6-)", "[W(10)O(32)](5-)", "[W10O32]4-"]}