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| Formula | C22H32N4O4 |
| Molar mass | 416.522 g·mol−1 |
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Tonapofylline (BG-9928) is a drug which acts as a potent and selective antagonist for the adenosine A1 receptor. It was developed as a potential agent for the treatment of heart failure by increasing sodium excretion by the kidneys, and reached Phase III human clinical trials, showing reasonable efficacy with a good safety profile. However, it was ultimately not adopted for medical use, though it continues to be used in research. [1] [2] [3] [4] [5] [6] [7] Its activity as a phosphodiesterase inhibitor does not appear to have been tested, though most related xanthine derivatives are phosphodiesterase inhibitors as well as adenosine receptor antagonists.