Pregna-4,20-dien-3,6-dione

Pregna-4,20-dien-3,6-dione
Clinical data
Other names	Pregna-4,20-diene-3,6-dione
ATC code	None;
Identifiers
	IUPAC name (8S,9S,10R,13R,14S,17R)-17-ethenyl-10,13-dimethyl-2,7,8,9,11,12,14,15,16,17-decahydro-1H-cyclopenta[a]phenanthrene-3,6-dione;
CAS Number	177349-73-4 ;
PubChem CID	15429665;
ChemSpider	21375166;
CompTox Dashboard (EPA)	DTXSID701032869 ;
Chemical and physical data
Formula	C21H28O2
Molar mass	312.453 g·mol−1
3D model (JSmol)	Interactive image;
	SMILES C[C@]12CC[C@H]3[C@H]([C@@H]1CC[C@@H]2C=C)CC(=O)C4=CC(=O)CC[C@]34C;
	InChI InChI=1S/C21H28O2/c1-4-13-5-6-16-15-12-19(23)18-11-14(22)7-9-21(18,3)17(15)8-10-20(13,16)2/h4,11,13,15-17H,1,5-10,12H2,2-3H3/t13-,15-,16-,17-,20+,21+/m0/s1; Key:CNHWGARUXXETPK-SMWYYAGTSA-N;

Pregnadienedione (PDD), or pregna-4,20-dien-3,6-dione, is a steroid and pherine, or synthetic pheromone. PDD has been found to activate the vomeronasal organ in men. 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.