4-Chloroaniline-d4 is the d4 labelled analogue of 4-Chloroaniline (C377500) which is an organic chemical reagent and precursor in the synthesis of various drugs and dyestuffs. It is a building block and a degredation product of Chlorhexidine (C335045), an antiseptic as well as azo dyes and pigments in printing and textiles.