WARNING: This product is for research use only, not for human or veterinary use.

MedKoo CAT#: 532059

CAS#: 162042-44-6

Description: L-371,257 is a potent, high affinity human oxytocin (OT) receptor antagonist (Ki = 4.6 nM) that displays > 800-fold selectivity over human arginine vasopressin receptors V1a and V2. L-371,257 antagonizes oxytocin-induced contractions in isolated rat uterine tissue (pA2 = 8.44) and in anesthetised rats following intravenous and intraduodenal administration.

Chemical Structure

CAS# 162042-44-6

Theoretical Analysis

MedKoo Cat#: 532059
Name: L-371,257
CAS#: 162042-44-6
Chemical Formula: C28H33N3O6
Exact Mass: 507.2369
Molecular Weight: 507.59
Elemental Analysis: C, 66.26; H, 6.55; N, 8.28; O, 18.91

Price and Availability

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10.0mg USD 370.0 2 Weeks
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Synonym: L-371,257; L 371,257; L371,257.

IUPAC/Chemical Name: 1-[1-[4-(1-acetylpiperidin-4-yl)oxy-2-methoxybenzoyl]piperidin-4-yl]-4H-3,1-benzoxazin-2-one


InChi Code: InChI=1S/C28H33N3O6/c1-19(32)29-15-11-22(12-16-29)37-23-7-8-24(26(17-23)35-2)27(33)30-13-9-21(10-14-30)31-25-6-4-3-5-20(25)18-36-28(31)34/h3-8,17,21-22H,9-16,18H2,1-2H3


Appearance: Solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: Soluble in DMSO

Shelf Life: >2 years if stored properly

Drug Formulation: This drug may be formulated in DMSO

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

Preparing Stock Solutions

The following data is based on the product molecular weight 507.59 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL

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1: Williams PD, Bock MG, Evans BE, Freidinger RM, Gallicchio SN, Guidotti MT, Jacobson MA, Kuo MS, Levy MR, Lis EV, Michelson SR, Pawluczyk JM, Perlow DS, Pettibone DJ, Quigley AG, Reiss DR, Salvatore C, Stauffer KJ, Woyden CJ. Nonpeptide oxytocin antagonists: analogs of L-371,257 with improved potency. Bioorg Med Chem Lett. 1999 May 3;9(9):1311-6. PubMed PMID: 10340620.

2: Kuo MS, Bock MG, Freidinger RM, Guidotti MT, Lis EV, Pawluczyk JM, Perlow DS, Pettibone DJ, Quigley AG, Reiss DR, Williams PD, Woyden CJ. Nonpeptide oxytocin antagonists: potent, orally bioavailable analogs of L-371,257 containing a 1-R-(pyridyl)ethyl ether terminus. Bioorg Med Chem Lett. 1998 Nov 3;8(21):3081-6. PubMed PMID: 9873680.

3: Williams PD, Clineschmidt BV, Erb JM, Freidinger RM, Guidotti MT, Lis EV, Pawluczyk JM, Pettibone DJ, Reiss DR, Veber DF, et al. 1-(1-[4-[(N-acetyl-4-piperidinyl)oxy]-2-methoxybenzoyl]piperidin-4- yl)-4H-3,1-benzoxazin-2(1H)-one (L-371,257): a new, orally bioavailable, non-peptide oxytocin antagonist. J Med Chem. 1995 Nov 10;38(23):4634-6. PubMed PMID: 7473590.