PROBLEM TO BE SOLVED: To provide methods for using a compound which activates pyruvate kinase.SOLUTION: The present invention provides a method increasing lifetime of the red blood cells (RBCs) in need thereof comprising contacting an effective amount of a composition containing a compound represented by formula I or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier with blood. A method for regulating 2,3-diphosphoglycerate levels in blood in need thereof comprises contacting an effective amount of the composition with blood. [W, X, Y and Z are each independently CH or N; D and D1 are each independently a bond, NH, or the like; A is a substituted/unsubstituted aryl or the like; L is a bond, -C(O)-, or the like; R1 is an alkyl, cycloalkyl, aryl, heteroaryl, or heterocyclyl; R3 is independently halo or the like; n, h, and g are each independently an integer of 0-2; m is an integer of 1-3.]SELECTED DRAWING: None【課題】ピルビン酸キナーゼを活性化する化合物を使用するための方法の提供。【解決手段】式Iで表される化合物もしくはその薬学的に許容される塩及び薬学的に許容される担体を含む組成物の有効量を血液と接触させることを含み、その必要のある赤血球細胞(RBC)の寿命を延長する方法。前記組成物の有効量を血液と接触させることを含み、その必要のある血液中の2,3-ジホスホグリセリン酸レベルを調節するための方法。[W、X、Y、及びZは各々独立にCH又はN;D及びD1は各々独立に結合又はNH等;Aは置換/非置換のアリール等;Lは結合又は-C(O)-等;R1はアルキル、シクロアルキル、アリール、ヘテロアリール又はヘテロシクリル;R3は、各々独立にハロ等;n、h及びgは各々独立に0~2の整数;mは1~3の整数]【選択図】なし