S-(CARBOXYMETHYL)-CYSTEINE PHARMACEUTICAL COMPOUND AND PREPARATION METHOD AND USE THEREOF

Disclosed are S-(carboxymethyl)-cysteine compound (I) and the preparation method and the use thereof. Also disclosed are S-(carboxymethyl)-D-cysteine ammonium salt monohydrate and the use thereof in the preparation of medicines for preventing and treating diseases of the respiratory system, such as chronic obstructive pulmonary disease etc., in particular the use in preparing apophlegmatisms. The compounds can reduce the airway resistance and the production of oxide in rat COPD models, increase the level of antioxidant, and alleviate the damage caused by oxide and inflammation media to lungs. L'invention porte sur un composé de S-(carboxyméthyl)-cystéine (I) et sur son procédé de préparation et son utilisation. L'invention porte également sur le sel d'ammonium de S-(carboxyméthyl)-D-cystéine monohydraté et sur son utilisation dans la préparation de médicaments pour la prévention et le traitement de maladies du système respiratoire, telles que la bronchopneumopathie chronique obstructive, etc., en particulier