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Hydroquinone is a granular white solid organic compound. Its chemical formula is C6H4(OH)2, and it is industrially produced by two main methods. It also occurs naturally in multiple places, including in the defense mechanism of a bombardier beetle. It can also be found in the poodle-dog bush, and as an active toxin in the felt-ringed agaricus mushroom. The compound was found to be carcinogenic in rats—when taken orally—however there has been no research into the carcinogenic effects of hydroquinone on humans.