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| Other names | Pregna-4,20-diene-3,6-dione |
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| Formula | C21H28O2 |
| Molar mass | 312.453 g·mol−1 |
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Pregnadienedione (PDD), or pregna-4,20-dien-3,6-dione, is a steroid and pherine, or synthetic pheromone. [1] [2] PDD has been found to activate the vomeronasal organ in men. [1] [2] Moreover, inhalation by men has been found to affect autonomic and central function and to lower luteinizing hormone and testosterone levels, while inhalation by women has few or no effects. [1] [2]