1217766-70-5

Ketoconazole-d₃ is intended for use as an internal standard for the quantification of ketoconazole by GC- or LC-MS. Ketoconazole is a broad-spectrum triazole antifungal agent that has activity against C. albicans, C. krusei, C. tropicalis, C. glabrata, C. parapsilosis, C. neoformans, and A. fumigatus strains (IC₅₀s = 0.031-8 μg/ml).¹ It inhibits the fungal cytochrome P450 (CYP) isoform CYP51, also known as lanosterol 14α-demethylase, which arrests ergosterol biosynthesis at the fungal membrane. Ketoconazole also inhibits human CYP3A4 (IC₅₀ = 0.54 μM). Formulations containing ketoconazole have been used in the treatment of fungal infections.

Ketoconazole-d3 is the labeled analogue of Ketoconazole (K186000), which inhibits cytochrome P-450 dependent steps in the biosynthesis of steroid hormones in vivo. Antimetastatic and antineoplastic activity. Orally active 5-lipoxygenase and thromboxane synthase inhibitor.

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1. Dilmaghanian, S., Gerber, J.G., Filler, D.G., et al. Enantioselectivity of inhibition of cytochrome P450 3A4 (CYP3A4) by ketoconazole: Testosterone and methadone as substrates Chirality 16(2),79-85(2004).