The invention provides compounds of the general formula (I) STR1 and physiologically acceptable salts, solvates or non-toxic metabolically labile esters thereof where R 1 represents a halogen atom; Ar represents the group STR2 R 3 represents a C-linked tetrazolyl group; R 4 and R 5, which may be the same or different, each independently represent a hydrogen atom or a halogen atom or a C. sub.1-6 alkyl group; andHet represents an N-linked imidazolyl group optionally substituted at the 2-position.The compounds may be used in the treatment or prophylaxis of hypertension and diseases associated with cognitive disorders.
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(2008/06/13)
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