Bis(2,4,5-trichlorophenyl-6-carbopentoxyphenyl)oxalate

Bis(2,4,5-trichlorophenyl-6-carbopentoxyphenyl)oxalate (CPPO) is a component of lightsticks. It is often used instead of the more conventional phenyl oxalate ester in practical formulations, as it gives significantly better quantum yield.