3-(1-Oxopropoxy)-pregnan-20-one-d5 is the labeled version of 3-(1-Oxopropoxy)-pregnan-20-one, which is the propyl ester of the parent compound, (3α)-Allopregnanolone (A547100).3-(1-Oxopropoxy)-pregnan-20-one is part of a study of androstane and pregnane series for allosteric modulation of GABAA receptor-chloride ionophore complex as one of the drug derivatives to elleviate stress, anxiety, seizures, mood disorders, PMS and PND and to induce anesthesia.