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| Formula | C16H23N5 |
| Molar mass | 285.395 g·mol−1 |
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U-89843A (PNU-89843) is asedative drug which acts as anagonist atGABAAreceptors, specifically acting as a positive allosteric modulator selective for the α1, α3 and α6 subtypes.[1] It has sedative effects in animals but without causingataxia, and also acts as anantioxidant and may haveneuroprotective effects.[2] It was developed by a team at Upjohn in the 1990s.[3]