Do not use if the drug properties change.

药品性状发生改变时禁止服用。

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Molecular descriptors, which describe the topological, electronic, and geometric features of a molecule, have been routinely used in computational prediction of drug properties.

分子描述符描述化合物的拓扑、电子和几何特征，在预测药物性质中广泛应用。

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The vitamin, which is normally associated with anti-ageing properties, forms a mesh inside the lens, which slows the release of the drug, ensuring it spends much longer in the eye.

维生素，通常被认为有抗衰老的特性，在隐形眼镜内部形成一个网眼，延缓了药物的释放过程，确保药物可以在眼睛里停留更长的时间。

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It is also used as a drug of abuse for these properties, which have given it a bad name.

CNN: Is it safe to use ketamine as a pain drug?

Political pressure for a ban soon became irresistible, even though the ACMD had virtually no evidence at all about the pharmacological properties of the drug itself.

ECONOMIST: Plain speaking on a highly coloured issue

Merck is using Symyx's tools to test forms of drug candidates to determine their physical properties before giving them to humans.

FORBES: Upstart Symyx is shaking up the stodgy chemicals industry.