2-[(2-Amino-3-chlorophenyl)thio]-benzoic Acid Methyl Ester is an intermediate in the synthesis of 9-Chloro Quetiapine (C366040). 9-Chloro Quetiapine is an impurity of Quetiapine hemifumarate (Q510000), a dibenzothiazepine antipsychotic medication used in the treatment of schizophrenia.