Purity >95%. 2,3-Butanedione-2-monoxime (BDM) is a non-selective, reversible myosin ATPase inhibitor with phosphatase-like properties. It demonstrates direct and indirect actions on cardiac and vascular smooth muscle, inhibiting L-type Ca2+ channels. BDM has been shown to be involved in a number of biological activities, including muscle contraction and synaptic transmission.