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.

Isotonitazene (citrate)

Item No. 40425

Restricted Product (Schedule I)
Product Insert (PDF)Safety Data Sheet (SDS) (PDF)
Technical Information
Formal Name
N,N-diethyl-2-[[4-(1-methylethoxy)phenyl]methyl]-5-nitro-1H-benzimidazole-1-ethanamine, 2-hydroxypropane-1,2,3-tricarboxylic acid
Molecular Formula
C23H30N4O3 • C6H8O7
Formula Weight
602.6
Purity
≥98%
Formulation
A solid
Solubility(Learn about Variance in Solubility)
DMSO: Soluble
SMILES
CCN(CC)CCN1C(CC2=CC=C(OC(C)C)C=C2)=NC3=CC([N+]([O-])=O)=CC=C31.OC(CC(O)=O)(CC(O)=O)C(O)=O
InChi Code
InChI=1S/C23H30N4O3.C6H8O7/c1-5-25(6-2)13-14-26-22-12-9-19(27(28)29)16-21(22)24-23(26)15-18-7-10-20(11-8-18)30-17(3)4;7-3(8)1-6(13,5(11)12)2-4(9)10/h7-12,16-17H,5-6,13-15H2,1-4H3;13H,1-2H2,(H,7,8)(H,9,10)(H,11,12)
InChi Key
OYOMETVMOXWJLJ-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

    $90

    Add

    5 mg

    $402

    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

    Isotonitazene (citrate) (Item No. 40425) is an analytical reference standard categorized as an opioid.1,2,3 Isotonitazene has analgesic effects in mice.4 It has been associated with overdoses.5 Isotonitazene 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. Casy, A.F., and Wright, J. Ionisation constants and partition coefficients of some analgesically active 2-benzylbenzimidazole derivatives and related compounds. J. Pharm. Pharmacol. 18(10), 677-683 (1966).

    2. Blanckaert, P., Cannaert, A., Van Uytfanghe, K., et al. Report on a novel emerging class of highly potent benzimidazole NPS opioids: Chemical and in vitro functional characterization of isotonitazene. Drug Test. Anal. 12(4), 422-430 (2019).

    3. 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).

    4. 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).

    5. Shover, C.L., Falasinnu, T.O., Freedman, R.B., et al. Emerging characteristics of isotonitazene-involved overdose deaths: A case-control study. J. Addict. Med. 15(5), 429-431 (2021).

    Product Citations

    Truver, M.T., Roman, M., Gomonit, M.M., et al. Fatal intoxications with nitazenes: Postmortem findings, toxicology, and in vitro characterization at the μ-opioid receptor of six nitazene analogues. Arch. Toxicol. (2026).

    Kozell, L.B., Eshelman, A., J., Wolfrum, K.M., et al. Pharmacologic characterization of substituted nitazenes at μ, κ, and Δ opioid receptors suggests high potential for toxicity. J. Pharmacol. Exp. Ther. 389(2), 219-228 (2024).

    Monti, M.C., De Vrieze, L.M., Vandeputte, M.M., et al. Detection of N-desethyl etonitazene in a drug checking sample: Chemical analysis and pharmacological characterization of a recent member of the 2-benzylbenzimidazole "nitazene" class. J. Pharm. Biomed. Anal. 251:116453, (2024).