Tricyclic heterocyclic sulfonamide and sulfonic ester derivatives

A compound represented by the following formula (I) or a pharmacologically acceptable salt thereof:

• ##STR85## wherein G represents an aromatic 5- or 6-membered ring having 1 or 2 substituents, said substituents each being selected from the group consisting of a halogen atom, a linear or branched C.sub.1 -C.sub.6 alkyl group, a linear or branched C.sub.1 -C.sub.6 alkoxy group, and an amino group optionally substituted by linear or branched C.sub.1 -C.sub.6 alkyl groups;
• L represents oxygen or --N(R.sup.1)--, wherein R.sup.1 represents hydrogen or lower alkyl;
• and
• M represents ##STR86## wherein rings A and B represent each an optionally substituted unsaturated 5- or 6-membered ring, wherein the substituents are each selected from the group consisting of a halogen atom, a linear or branched C.sub.1 -C.sub.6 alkyl group optionally substituted by a hydroxy group, a linear or branched C.sub.1 -C.sub.6 alkoxy group optionally substituted by a hydroxy group, a hydroxy group, an amino group optionally substituted by linear or branched C.sub.1 -C.sub.6 alkyl groups optionally having a hydroxy group, C.sub.1 -C.sub.4 acyl groups, a cyano group and an oxo group;
• and
• Y represents oxygen, --S(O).sub.n --, --C(R.sup.3)(R.sup.4)--, --C(O)--, --N(R.sup.5)--, --CH(R.sup.6)CH(R.sup.7)--, --C(R.sup.8).dbd.C(R.sup.9)--, --N(R.sup.10)C(O)--, --C(O)N(R.sup.10)--, --N.dbd.C(R.sup.11)--, --C(R.sup.11).dbd.N--, --OCH(R.sup.12)--, --CH(R.sup.12)O--, --S(O).sub.n CH(R.sup.13)--, --CH (R.sup.13)S(O).sub.n --, --N(R.sup.14)CH(R.sup.15)-- or --CH(R.sup.15)N(R.sup.14)--, wherein n represents 0, 1 or 2, R.sup.3, R.sup.4, R.sup.6, R.sup.7, R.sup.8, R.sup.9, are the same or different from one another and each represents hydrogen or lower alkyl, R.sup.5 , R.sup.10, R.sup.11, R.sup.12, R.sup.13 and R.sup.15 each represents hydrogen or lower alkyl, and R.sup.14 represents hydrogen, lower alkyl or lower acyl.