Alpelisib hydrochloride (BYL-719 hydrochloride) shows antineoplastic activity[1][2]. Alpelisib hydrochloride (BYL-719 hydrochloride) is a potent, orally active, and selective PI3Kα inhibitor with IC50s of 5 nM, 250 nM, 290 nM and 1200 nM for p110α, p110γ,