1. Cinchonidine is an alkaloid found in the bark of the cinchona tree.
金鸡纳碱是在金鸡纳树皮中发现的一种生物碱。
2. The medicinal properties of cinchonidine make it useful in the treatment of malaria.
金鸡纳碱的药用性质使其对治疗疟疾非常有用。