This invention relates to a compound and the use of the compound of the formula
##STR1##
wherein R1, R2, R3, R4 and R5
are as defined in the description, A signifies —CHCH—
or —CC—; and B signifies
##STR2##
wherein R6 to R26, X and Y are as defined in the specification
or a pharmaceutically acceptable salt thereof, for use in pharmaceutical compositions
for the treatment or prevention of mGluR5 receptor mediated disorders.