Compounds of formula (I): 1
wherein:
X represents oxygen or sulphur or a group CH.sub.2 or 2
R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are as defined in
the description,
A represents an alkylene chain as defined in the description,
B represents alkyl or alkenyl substituted by a group 3
or R.sup.9, or B represents a group 4
or R.sup.9,
D represents a benzene, pyridine, pyrazine, pyrimidine or pyridazine
nucleus.
Medicaments
