Diphenyl oxalate

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What Wikipedia says

Diphenyl oxalate (trademark name Cyalume) is a solid whose oxidation products are responsible for the chemiluminescence in a glowstick. This chemical is the double ester of phenol with oxalic acid. Upon reaction with hydrogen peroxide, 1,2-dioxetanedione is formed, along with release of the two phenols.

Excerpt from the Wikipedia article “Diphenyl oxalate”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Rhadamante, Public domain, via Wikimedia Commons.