The invention concerns novel, pharmaceutically useful, benzheterocyclyl sulphones of the formula I: ##STR1## in which ring A may bear optional halogeno, (1-4C)alkyl or fluoro(1-4C)alkyl substituents; X is oxygen, or a group of the formula --S(O).sub.n -- or --NR.sup.1 -- in which n is zero, 1 or 2 and R.sup.1 is hydrogen, (1-4C)alkyl, (1-6C) alkanoyl, benzoyl or phenyl(1-4C)alkyl, the last two optionally substituted; Y is various linking groups defined hereinafter, such as ethylene or trimethylene; and in which the group --SO.sub.2 CH.sub.2 NO. sub.2 is located at position a, b or c in ring A; together with the non- toxic thereof. Other aspects of the invention include the production of the novel compounds by analogy processes and pharmaceutical compositions of the novel compounds for use in the treatment of diabetic complications.
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