| abstract |
Compounds of formula (I): n n nwherein:n X represents an oxygen or a sulphur or CH 2 or n n R 1 and R 2 represent a hydrogen atom, or a group as defined in the description, A represents an alkylene chain as described in the description, B is as defined in the description, R 3 and R 4 represent a hydrogen atom or a group as defined in the description, D represents an optionally substituted benzene, optionally substituted pyrazine, optionally substituted pyrimidine or optionally substituted pyridazinen nand medicinal products containing the same which are useful in treating or preventing melatoninergic disorders. |