Dinoprost-13C5 is 13C labeled Dinoprost (HY-12956). Dinoprost (Prostaglandin F2alpha) 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[1][2].