Benzothiadiazine compounds

A compound of formula (I):

• wherein:
• R1 represents hydroxy, RCO—O— or RCO—NRa—,
• R2 represents hydrogen, halogen, or hydroxy, R′CO—O or R′CO—NR′a—,
• R and R′, which may be identical or different, represent linear or branched (C1-C6)alkyl optionally substituted by aryl, linear or branched (C2-C6)alkenyl optionally substituted by aryl, linear or branched (C1-C6)perhaloalkyl, (C3-C7)cycloalkyl, adamantyl, aryl or heteroaryl,
• Ra and R′a, which may be identical or different, represent hydrogen or linear or branched (C1-C6)alkyl, linear or branched (C1-C6)perhaloalkyl, linear or branched (C1-C6)acyl, aryl or heteroaryl,
• its isomers and addition salts thereof with a pharmaceutically acceptable acid or base,
• it being understood that:
• “aryl group” is understood to mean a monocyclic aromatic group, or a bicyclic group in which at least one of the rings is aromatic, wherein the aryl group is selected from phenyl, naphthyl, and tetrahydronaphthyl, which groups are optionally substituted by one or more, identical or different, groups selected from halogen, linear or branched (C1-C6)alkyl, linear or branched (C1-C6)alkoxy, linear or branched (C1-C6)perhaloalkyl, linear or branched (C1-C6)perhaloalkoxy, hydroxy, cyano, nitro, amino (optionally substituted by one or more linear or branched (C1-C6)alkyl groups), aminosulphonyl (optionally substituted by one or more linear or branched (C1-C6)alkyl groups) and phenyl (optionally substituted by one or more, identical or different, groups selected from halogen, linear or branched (C1-C6)alkyl, linear or branched (C1-C6)perhaloalkyl, hydroxy and linear or branched (C1-C6)alkoxy),
• “heteroaryl group” is understood to mean a monocyclic aromatic group, or a bicyclic group in which at least one of the rings is aromatic, wherein the heteroaryl group is selected from pyridyl, pyrrolyl, thienyl, furyl, imidazolyl, and indolyl, which groups contain one, two or three identical or different hetero atoms selected from nitrogen, oxygen and sulphur, and are optionally substituted by one or more, identical or different, groups selected from halogen, linear or branched (C1-C6)alkyl, linear or branched (C1-C6)alkoxy, linear or branched (C1-C6)perhaloalkyl, linear or branched (C1-C6)perhaloalkoxy, hydroxy, cyano, nitro, amino (optionally substituted by one or more linear or branched (C1-C6)-alkyl groups) and aminosulphonyl (optionally substituted by one or more linear or branched (C1-C6)alkyl groups).