...H 3 C H 3 CH 3 O N OH C H 3 O CH 3 O OH NH 2 O OH N N O O OH NC a b 苯丙醇胺的结构修饰： 苯丙醇胺（Phenylpropanolamine）：具有β受体阻断、奎尼 丁样、降压和局麻等多种作用。 柔性分子， 有多种低能 构象，可与 不同受体结 合的缘故。
Until 2000 or so, most cold remedies contained phenylpropanolamine as the decongestant.
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2.
Further, he points out, chemically similar drugs like the decongestent phenylpropanolamine (PPA) and the dietary supplement Ephedra have already been pulled from the market for heart risk.