Ethyl N-(3-Chloro-6,11-dihydro-6-methyl-5,5-dioxidodibenzo[c,f][1,2]thiazepin-11-yl)-amino-propanoate-d4 is the deuterated form of Ethyl N-(3-Chloro-6,11-dihydro-6-methyl-5,5-dioxidodibenzo[c,f][1,2]thiazepin-11-yl)-amino-propanoate (E903735), which is used in the preparation of dibenzothiazepines as opioid receptor agonists; Also, it is an intermediate used in the synthesis of N-(3-Chloro-6,11-dihydro-6-methyl-5,5-dioxidodibenzo[c,f][1,2]thiazepin-11-yl)-β-alanine-d4, which is an isotope labelled N-(3-Chloro-6,11-dihydro-6-methyl-5,5-dioxidodibenzo[c,f][1,2]thiazepin-11-yl)-β-alanine is a metabolite of Tianeptine (T436800), a tricyclic compound with psychostimulant, anti-ulcer and anti-emetic properties. Antidepressant.