Importance

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Abstract

Compounds of general formula (I) ##STR1## wherein E is O or S; R is C.sub.1 -C.sub.5 straight, branched or cyclic alkyl or C.sub.2 -C.sub.5 alkenyl; X can be H, F, Cl, Br, I, CF.sub.3 ; n is an integer 1 to 4; m is an integer 0 to 4; A and B are 5- or 6-membered aromatic carbocyclic rings optionally containing one or more heteroatoms selected from N, O, S and carrying the substituents R.sub.1, R.sub.2 and R.sub.3, respectively; R.sub.1 can be hydrogen, halogen, C.sub.1 -C.sub.4 alkoxycarbonyl, a sulfonic group or a tetrazole group of formula ##STR2## wherein R.sub.4 can be hydrogen or C.sub.1 -C.sub.5 alkyl; R.sub.2 can be hydrogen or a COOR.sub.4 group (wherein R.sub.4 is hydrogen or C.sub.1 -C.sub.5 alkyl), CN, SO.sub.3 H, PO.sub.3 H or a tetrazole group R.sub.3 ; can be a hydrogen or a moiety of formula (II) B'(R'.sub.2,R'.sub.3) (II) wherein: B.sup.1, R.sup.1.sub.2 have the same meanings reported above for B and R.sub.2, R'.sub.3 is H; with the proviso that when A is phenyl, R.sub.1 is different from H, and the pharmaceutically acceptable salts thereof.

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First Claim