abstract |
PROBLEM TO BE SOLVED: To provide a method for treating a PI3Kδ-related disorder using a pyrazolopyrimidine derivative. 1-{1- [5-chloro-3- (1-isopropylazetidine-3-yl) -2-methoxy-4-methylphenyl] ethyl} -3-methyl-1H-pyrazolo [3, 4-d] A pyrazolopyrimidine derivative exemplified by pyrimidine-4-amine, or a pharmaceutically acceptable salt thereof. [Selection diagram] None |