PROBLEM TO BE SOLVED: To provide an N-pyridazine-3-ylsulfonamide derivative useful as a therapeutic and/or preventive agent for central nervous diseases, and a pharmaceutically acceptable salt thereof.SOLUTION: The present invention provides a compound represented by formula (1) or a pharmaceutically acceptable salt thereof. [ring B is C6-10 aryl or 5-10 membered heteroaryl R1A is halo, substituted/unsubstituted C1-10 alkyl, substituted/unsubstituted amino or the like R1B is H, halo, substituted/unsubstituted C1-10 alkyl or the like R1C and R1D independently represent H, halo or the like A1 and A2 independently represent H, C1-3 alkyl or the like R2 is substituted/unsubstituted C1-10 alkyl, C6-10 aryl, 5-10 membered heteroaryl and the like].SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】中枢神経系疾患の治療剤及び/又は予防剤として有用なN-ピリダジン-3-イルスルホンアミド誘導体及びその製薬学的に許容される塩の提供。【解決手段】式(1)で表される化合物又はその製薬学的に許容される塩。[環BはC6-10アリール又は5~10員のヘテロアリール;R1Aはハロ、置換/非置換のC1-10アルキル、置換/非置換のアミノ等;R1BはH、ハロ、置換/非置換のC1-10アルキル等;R1C及びR1Dは各々独立にH、ハロ等;A1及びA2は各々独立にH、C1-3アルキル等;R2は置換/非置換のC1-10アルキル、C6-10アリール、5~10員のヘテロアリール等]【選択図】なし
