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| ECHA InfoCard | 100.162.425 | 
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| Formula | C16H24N4O2 | 
| Molar mass | 304.394 g·mol−1 | 
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| Melting point | 191 to 194 °C (376 to 381 °F) | 
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8-Cyclopentyl-1,3-dipropylxanthine (DPCPX, PD-116,948) is a drug which acts as a potent and selective antagonist for the adenosine A1 receptor. [1] [2] It has high selectivity for A1 over other adenosine receptor subtypes, but as with other xanthine derivatives DPCPX also acts as a phosphodiesterase inhibitor, and is almost as potent as rolipram at inhibiting PDE4. [3] It has been used to study the function of the adenosine A1 receptor in animals, [4] [5] which has been found to be involved in several important functions such as regulation of breathing [6] and activity in various regions of the brain, [7] [8] and DPCPX has also been shown to produce behavioural effects such as increasing the hallucinogen-appropriate responding produced by the 5-HT2A agonist DOI, [9] and the dopamine release induced by MDMA, [10] as well as having interactions with a range of anticonvulsant drugs. [11] [12]