C18H21ClN2

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