The molecular formula C₁₈H₂₁ClN₂ may refer to:

• Chlorcyclizine
• 1-(3-Chlorophenyl)-4-(2-phenylethyl)piperazine (3C-PEP)
• Clomacran
• Norclomipramine, also known as N-desmethylclomipramine and chlordesipramine

Index of chemical compounds with the same molecular formula

This set index page lists chemical structure articles associated with the same molecular formula.
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