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4-Caffeoyl-1,5-quinide (4-caffeoylquinic-1,5-lactone or 4-CQL) is found in roasted coffee beans. It is formed by lactonization of 4-O-caffeoylquinic acid during the roasting process.
It is reported to possess opioid antagonist properties in mice.
References
4-Caffeoyl-1,5-quinide Wikipedia(Text) CC BY-SA