3,7-Dimethylxanthine. The principle alkaloid in Theobroma cacao (the cacao bean) and other plants.

Proxyphylline is a dual of adenosine A1/A2a receptor inhibitor and phosphodiesterase (PDE) inhibitor. Proxyphylline acts as a cardiac stimulant vasodilator and bronchodilator.

4-Hydroxycoumarin, a coumarin derivative.4-Hydroxycoumarin serves as an immediate precursor of 4-hydroxycoumarin (4HC) type anticoagulants (for example, warfarin).?4-Hydroxycoumarin derivatives ?are employed as the anticoagulant, antibacterial, antifungal, antiviral, antitumor, antiprotozoal, insecticidal, antimycobacterial, antimutagenic, antioxidant, anti-inflammatory agents, HIV protease inhibitors and tyrosine kinase inhibitors.