这种药物含有茶碱，可以有效缓解哮喘患者的呼吸困难。

This medication contains ___theophylline, which helps relieve breathing difficulties in asthma patients.

可可豆中含有少量茶碱，这是一种天然存在的化合物。

Cocoa beans contain small amounts of ___theophylline, a naturally occurring compound.