| abstract |
(57) Abstract: [PROBLEMS] To provide a methylphosphonic acid derivative having an excellent activity of increasing intracellular calcium ion concentration by acting on an inositol 1,4,5-trisphosphate (InsP 3 ) receptor. And A compound represented by the following structural formula (1) and a salt thereof; [In the formula, R 1 represents an alkyl group having 1 to 4 carbon atoms. ] |