α-Naphthoflavone, also known as 7,8-benzoflavone and 2-phenyl-benzo[h]chromen-4-one, is a synthetic[1][2] flavone derivative.

[3] α-Naphthoflavone is a potent inhibitor of the enzyme aromatase, the enzyme that converts testosterone to estrogen.

[1][2] α-Naphthoflavone has been shown to cause abnormal testicular development in young chickens.

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