From wikipedia[1]:

Theophylline is naturally found in cocoa beans. Amounts as high as 3.7 mg/g have been reported in Criollo cocoa beans.

Medical uses[edit]

The main actions of theophylline involve:

- relaxing bronchial smooth muscle - increasing heart muscle contractility and efficiency; as a positive inotropic - increasing heart rate: (positive chronotropic)[1] - increasing blood pressure - increasing renal blood flow - anti-inflammatory effects - central nervous system stimulatory effect mainly on the medullary respiratory center.

Theophylline is also a metabolite of caffeine[2].

1. https://en.wikipedia.org/wiki/Theophylline 2. https://en.wikipedia.org/wiki/Caffeine#Pharmacokinetics