(3aR,4R,5R,6aS)-Hexahydro-4-[(3R)-5-phenyl-3-[(tetrahydro-2H-pyran-2-yl)oxy]pentyl]-5-[(tetrahydro-2H-pyran-2-yl)oxy]-2H-cyclopenta[b]furan-2-ol is an intermediate in the synthesis of Latanoprost Acid-d4 which is the labeled analogue of Latanoprost Acid (L177310), a metabolite of Latanoprost. Latanoprost Acid (L177310) is a potent, selective FP prostanoid receptor agonist, a F-series Prostaglandin analog and is 200 times as potent as isopropyl ester form.