Sulfonamide compound

A compound represented by the following general formula (1) or a salt thereof, or a derivative thereof which is a prodrug:

• [in the formula, A represents a nitrogen-containing saturated ring;
• m represents an integer of 0, 1, or 2;
• n represents an integer of 1, 2, 3, or 4;
• G1 represents hydrogen atom, chlorine atom, hydroxyl group, an alkoxy group, or amino group;
• G2 represents a halogen atom, hydroxyl group, cyano group, carboxy group, an alkyl group which may be substituted, an alkenyl group which may be substituted, an alkynyl group which may be substituted, an alkoxy group which may be substituted, an alkylthio group which may be substituted, an amino group which may be substituted, an alkylsulfinyl group which may be substituted, an alkylsulfonyl group which may be substituted, or an aryl group which may be substituted;
• G3 represents hydrogen atom, a halogen atom, hydroxyl group, cyano group, carboxy group, an alkyl group which may be substituted, an alkenyl group which may be substituted, an alkynyl group which may be substituted, an alkoxy group which may be substituted, an alkylthio group which may be substituted, an amino group which may be substituted, an alkoxycarbonyl group which may be substituted, an acyl group which may be substituted, an acyloxy group which may be substituted, an alkylsulfinyl group which may be substituted, an alkylsulfonyl group which may be substituted, or an aryl group which may be substituted (provided that G3 substitutes at the 3-, 6-, 7-, or 8-position of the isoquinoline ring);
• G4 represents hydroxyl group, or —N(R1)(R2) (R1 and R2 may be the same or different, and independently represent hydrogen atom, an alkyl group which may be substituted, an aralkyl group which may be substituted, an alkenyl group which may be substituted, an alkynyl group which may be substituted, or a saturated heterocyclic group which may be substituted);
• and
• G5 represents a substituent on a ring-constituting carbon atom constituting the nitrogen-containing saturated ring represented by A, and represents hydrogen atom, fluorine atom, or an alkyl group].