式I的化合物是有价值的药物活性化合物。
The compounds of the formula I are valuable pharmacologically active compounds.
银杏叶提取物中含有黄酮类化合物等许多特殊的活性成分，不但可用于医药，还可以广泛地应用于食品、化妆品等。
Extract of Ginkgo leaves contains flavonoids and other special active components, which can be used not only in drugs, but also widely in foods and cosmetics etc.
某些空气污染物在光化学反应中变得活性更强，形成有毒的化合物。
Certain air pollutants become more reactive and form noxious compounds in photochemical reactions.
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