3-Deazaneplanocin A hydrochloride (DZNep hydrochloride) is a potent histone methyltransferase EZH2 inhibitor[1][2]. 3-Deazaneplanocin A hydrochlorideis a potent S-adenosylhomocysteine hydrolase (AHCY) inhibitor[6]. 3-Deazaneplanocin A hydrochloride also has anti-orthopoxvirus and anti-variola activities[7].