| http://www.w3.org/ns/prov#value | - A further group of preferred compounds of this invention are those of the formula (IV): ##STR6## or a pharmaceutically acceptable salt, ester or amide thereof, wherein Z is as defined in relation to formula (II), R11 is a hydrogen atom or a methyl group; R12 is a hydrogen atom or a methyl group; and m is 1, 2 or 3.
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