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:

Evolving therapeutic targets in ischemic stroke: a concise review. Ischemic stroke is the leading cause of mortality and morbidity worldwide for which the assemblage of therapeutic interventions has remained outstandingly limited. Several new insights into the causes of neuronal death during ischemic event have led to the identification of some important novel targets for intervention. This article highlights some of the promising protein targets, which are in the validation process and have the potential to get translated into viable neurotherapeutics against ischemic stroke.
{"Chemical": []}