An Analytical Reference Standard
Technical Support & Resources

Visit our FAQ

Contact Us

Toll Free Phone (USA and Canada Only): (888) 526-5351
Direct Phone: (734) 975-3888

Request Technical Support

Technical Support Request

To streamline the process attach the appropriate questionnaire to your inquiry.

Download IHC QuestionnaireDownload WB Questionnaire

View Our Privacy Statement for details on how we use and protect your data. In addition, this site is protected by hCaptcha and its Privacy Policy and Terms of Service apply.

Metonitazene (citrate)

Item No. 31303

Restricted Product (Schedule I)
Product Insert (PDF)GC-MS (PDF)Safety Data Sheet (SDS) (PDF)
Technical Information
Formal Name
N,N-diethyl-2-[(4-methoxyphenyl)methyl]-5-nitro-1H-benzimidazole-1-ethanamine, 2-hydroxy-1,2,3-propanetricarboxylate
Molecular Formula
C21H26N4O3 • C6H8O7
Formula Weight
574.6
Purity
≥98%
Formulation
A crystalline solid
Solubility(Learn about Variance in Solubility)
DMF: 10 mg/mlDMSO: 10 mg/mlPBS (pH 7.2): 1 mg/ml
λmax
241, 306 nm
SMILES
CCN(CC)CCN1C(CC2=CC=C(OC)C=C2)=NC3=CC([N+]([O-])=O)=CC=C31.OC(CC(O)=O)(C(O)=O)CC(O)=O
InChi Code
InChI=1S/C21H26N4O3.C6H8O7/c1-4-23(5-2)12-13-24-20-11-8-17(25(26)27)15-19(20)22-21(24)14-16-6-9-18(28-3)10-7-16;7-3(8)1-6(13,5(11)12)2-4(9)10/h6-11,15H,4-5,12-14H2,1-3H3;13H,1-2H2,(H,7,8)(H,9,10)(H,11,12)
InChi Key
HJRWCNRBAWVTKS-UHFFFAOYSA-N
Regulatory Information
DEA Schedule
I
Shipping & Storage Information
Storage
-20°C
Shipping
Room temperature in continental US; may vary elsewhere
Recommended Products

Certificates of Analysis & Batch Specific Data

Provide batch numbers separated by commas to download or request available product inserts, QC sheets, certificates of analysis, data packs, and GC-MS data.

Download most recent Certificate of Analysis for this product

    1 mg

    $103

    Add

    5 mg

    $427

    Add
    Cayman Chemical
    Cayman Spectral Library

    Our free, searchable, GC-MS spectral database contains 70eV EI mass spectral data of 2,000+ of Cayman’s forensic drug standards.

    DOWNLOAD THE DATABASE
    Product Description

    Metonitazene (citrate) (Item No. 31303) is an analytical reference standard categorized as an opioid.1 Metonitazene has analgesic effects in mice.2 Metonitazene is regulated as a Schedule I compound in the United States. This product is intended for research and forensic applications.

    WARNING This product is not for human or veterinary use.

    References & Product Citations
    Product Description References

    1. Vandeputte, M.M., Van Uytfanghe, K., Layle, N.K., et al. Synthesis, chemical characterization, and µ-opioid receptor activity assessment of the emerging group of "nitazene" 2-benzylbenzimidazole synthetic opioids. ACS Chem. Neurosci. 12(7), 1241-1251 (2021).

    2. Ujváry, I., Christie, R., Evans-Brown, M., et al. DARK classics in chemical neuroscience: Etonitazene and related benzimidazoles. ACS Chem. Neurosci. 12(7), 1072-1092 (2021).

    Product Citations

    Hataoka, K., Hojo, M., Nomura, S., et al. Evaluation of rewarding effects of nitazene analogs: results from conditioned place preference tests and in vivo microdialysis experiments in mice. J. Toxicol. Sci. 50(1), 33-43 (2025).

    Tsai, M.-H.M., Chen, L., Baumann, M.H., et al. In Vitro Functional Profiling of Fentanyl and Nitazene Analogs at the μ-Opioid Receptor Reveals High Efficacy for Gi Protein Signaling. ACS Chem. Neurosci. 15(4), 854-867 (2024).

    Glatfelter, G.C., Vandeputte, M.M., Chen, L., et al. Alkoxy chain length governs the potency of 2-benzylbenzimidazole “nitazene” opioids associated with human overdose. Psychopharmacology (Berl.) (2023).