Dinoprost-d 9 is the deuterium labeled Dinoprost. Dinoprost (Prostaglandin F2α) is an orally active, potent prostaglandin F (PGF) receptor ( FP receptor) agonist. Dinoprost is a luteolytic hormone produced locally in the endometrial luminal epithelium and corpus luteum (CL). Dinoprost plays a key role in the onset and progression of labour.