Cyclobenzaprine-d3 (hydrochloride) (CRM)

Cyclobenzaprine-d₃ (hydrochloride) (CRM) contains three deuterium atoms at the terminal methyl group. It is intended for use as an internal standard for the quantification of cyclobenzaprine by GC- or LC-mass spectrometry. Cyclobenzaprine is a skeletal muscle relaxant that also has sedative properties.^1,2,3 It has been shown to antagonize muscarinic receptors (K_is = 25, 60, and 6 nM for M₁, M₂, and M₃, respectively), serotonin 5-HT₂ receptors (K_is = 56 and 330 nM for 5-HT_2C and 5-HT_2B, respectively), and histamine H₁ receptor (IC₅₀ = 20 nM).^4,5,6

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