This invention relates to novel compounds represented by the general
formula [I]:
##STR1##
(wherein, R.sup.1 and R.sup.4 are the same or different, and represent
hydrogen atoms, lower alkyl groups or the like; R.sup.2 and R.sup.3 are
the same or different, and represent lower alkoxy groups or lower alkyl
groups; R.sup.5 represents a lower alkyl group or aralkyl group optionally
having substituent(s); R.sup.6 represents a hydrogen atom or a lower alkyl
group; X represents O, S or NH; m represents an integer of 0 to 3; n
represents an integer of 0 or 1; and Ar represents a phenyl group or
heteroaryl group optionally having substituent(s)).
The compounds of the invention have an antagonistic action on orexin
receptors, and are useful for treatment of appetite abnormality, obesity,
sleeping disorder or the like.
