PIK-293 is a selective small molecule inhibitor of phosphoinositide 3-kinase delta (PI3Kdelta) with an IC50 of 0.24 µM, demonstrating lower activity against the PI3Kalpha, beta, and gamma isoforms. This compound is a valuable research tool for studying PI3Kdelta signaling in immunological and oncological contexts, applicable in both in vitro and in vivo experimental models.