2. GPCR/G Protein
  3. Oxytocin Receptor
  4. L-368,899

L-368,899 is an orally active and selective OT (oxytocin ) receptor antagonist, with IC50s of 8.9 and 26 nM for uterus of rat and human, respectively. L-368,899 can cross the blood-brain barrier (BBB). L-368,899 inhibits oxytocin-stimulated uterine contractions in rats and can be used in study of preterm labor.

At equivalent molar concentrations, both the salt and free forms of a compound exhibit comparable biological activity. Nevertheless, the salt form (L-368,899 hydrochloride) usually boasts enhanced water solubility and stability.

For research use only. We do not sell to patients.

CAS No. : 148927-60-0

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Top Publications Citing Use of Products

    L-368,899 purchased from MedChemExpress. Usage Cited in: Cell. 2025 Jun 26;188(13):3530-3549.e24.  [Abstract]

    L-368,899 hydrochloride (Oxtr antagonist) (10 mg/kg; i.p.; 20 min) treatment abolished the increased rebound activity of mPFCCacna1h+ neurons in estrus female mice induced by oxytocin.

    L-368,899 purchased from MedChemExpress. Usage Cited in: Research (Wash D C). 2025 Dec 16.

    Local application of the OXT receptor antagonist L-368,899 hydrochloride (1.25 mM; 500 nL per hemisphere) significantly reduced the peak Ca2+ activity of CCK neurons in CCK-Cre mice during initial interactions with a familiar mouse.

    L-368,899 purchased from MedChemExpress. Usage Cited in: Neurosci Res. 2021 Jul:168:41-53.  [Abstract]

    Oxytocin antagonist L-368,899 hydrochloride (10 mg/kg; i.p.; 10 min) significantly increased the amplitudes of the VMR in C57BL/6J mice to graded CRD atall pressures compared with saline.

    L-368,899 purchased from MedChemExpress. Usage Cited in: Neurosci Res. 2021 Jul:168:41-53.  [Abstract]

    Oxytocin antagonist L-368,899 hydrochloride (10 mg/kg; i.p.; 10 min) significantly decreased the percentage of timespent and distance of C57BL/6J mice in open arms.

    L-368,899 purchased from MedChemExpress. Usage Cited in: Neurosci Res. 2021 Jul:168:41-53.  [Abstract]

    Oxytocin antagonist L-368,899 hydrochloride (10 mg/kg; i.p.; 10 min) significantly upregulated c-Fos-positive cells and c-Fos positive cells colocalized with CRH positive cells in the central amygdala (CeA) of C57BL/6J mice.

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    Description

    L-368,899 is an orally active and selective OT (oxytocin ) receptor antagonist, with IC50s of 8.9 and 26 nM for uterus of rat and human, respectively. L-368,899 can cross the blood-brain barrier (BBB). L-368,899 inhibits oxytocin-stimulated uterine contractions in rats and can be used in study of preterm labor[1][2][3].

    IC50 & Target

    IC50: 8.9 nM (rat uterus), 26 nM (human uterus)[3].
    In Vivo

    L-368,899 (0.1, 0.3, 1 mg/kg; infused i.v.; single) shows a dose-related antagonism of OT-stimulated uterine contractions with an AD50 value of 0.35 mg/kg in vivo[1].
    L-368,899 (3, 10, 30 mg/kg; i.d.; single) inhibits the contractile effects of OT (AD50= 7 mg/kg) with a long (>4 h) duration of action in vivo (AD50: the dose of L-368,899 required to reduce the response to OT by 50%)[1].
    L-368,899 (10 mg/kg, p.o.; single) shows bioavailability (AUC 0-6 h) of 35%[1].
    L-368,899 (0.54, 1.8, 5.4 mg/kg; i.v.; single) reduces both oxytocin-induced and endogenous increases in plasma PGFM concentration[2].

    MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

    Animal Model: Adult female Sprague-Dawley rats (250-350 g)[1].
    Dosage: 0.1, 0.3, 1 mg/kg
    Administration: Infused intravenous injection; single.
    Result: Inhibited OT-stimulated uterine contractions with an AD50 value of 0.35 mg/kg.
    Animal Model: Adult female Sprague-Dawley rats (250-350 g)[1].
    Dosage: 3, 10, 30 mg/kg
    Administration: Intraduodenal; single.
    Result: Exhibited a antagonism of OT-stimulated uterine contractions with an AD50 of 7 mg/kg and duration of action more than 4 h.
    Animal Model: Adult female Sprague-Dawley rats (250-350 g)[1].
    Dosage: 10 mg/kg
    Administration: Oral administration, single.
    Result: Showed orally active with bioavailability (AUC 0-6 h) of 35%.
    Animal Model: Mature Dorset cross ewes (53-57 kg; Removal of ovaries)[2].
    Dosage: 0.54, 1.8, 5.4 mg/kg (3, 10 and 30 µg/kg/min for 3 h; dissolved in 0.9% saline).
    Administration: Intravenous infusion; single.
    Result: Led to a significant decrease in both the frequency (from 2.2 to 1.0 episodes/ewe) and amplitude (from 68.8 to 31.8 pg/mL) of episodes of increased plasma concentration of PGFM.
    Molecular Weight

    554.77

    Formula

    C26H42N4O5S2
    CAS No.
    SMILES

    O=S(C[C@]12[C@H](C[C@@H](CC2)C1(C)C)NC([C@@H](N)CCS(C)(=O)=O)=O)(N3CCN(C4=C(C=CC=C4)C)CC3)=O
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    Room temperature in continental US; may vary elsewhere.
    Storage

    Please store the product under the recommended conditions in the Certificate of Analysis.
    Purity & Documentation
    References
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    L-368,899 Related Classifications

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    • Do most proteins show cross-species activity?

      Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.

    Keywords:

    L-368,899148927-60-0Oxytocin ReceptorOXTROTPGF2αPGFMpreterm laboruterine contractionsInhibitorinhibitorinhibit

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