The present invention provides a compound represented by the formula (I)
1
wherein R.sup.1 is a hydrogen atom, a halogen atom, an optionally
substituted hydrocarbon group, an optionally substituted heterocyclic
group, an optionally substituted hydroxy group, an optionally substituted
thiol group or an optionally substituted amino group,
A is an optionally substituted cyclic amino group or --NR.sup.2--W-D
wherein R.sup.2 is a hydrogen atom or an alkyl group, W is a bond or a
divalent acyclic hydrocarbon group, and D is an optionally substituted
cyclic group, an optionally substituted amino group or an optionally
substituted acyl group,
B is an optionally substituted hydrocarbon group or an optionally
substituted heterocyclic group,
X is an oxygen atom, a sulfur atom or an optionally substituted nitrogen
atom, and
Y is a bond or a divalent acyclic hydrocarbon group, or a salt thereof,
which is useful for the prophylaxis or treatment of diabetic neuropathy
and the like.
