KN-93 Phosphate (CAS 1188890-41-6) is a small-molecule inhibitor targeting calcium/calmodulin-dependent protein kinase II (CaMKII) It is designed to selectively inhibit CaMKII thereby modulating cellular proliferation survival neurotransmitter regulation and related signal transduction pathways KN-93 Phosphate exerts its biological activity primarily by competitively binding to Ca2 /calmodulin disrupting their interaction with CaMKII and preventing CaMKII activation and autophosphorylation In cell-based studies KN-93 Phosphate demonstrates inhibitory activity with IC50 values of 9 M for CaMKII monomer and 3 M for CaMKII dodecamer Experimental models include hepatic stellate cells and NIH 3T3 fibroblasts Based on these pharmacological properties KN-93 Phosphate holds research potential in the study of cell cycle regulation apoptosis neurotransmitter synthesis and neurodegenerative disorders particularly Parkinson s disease models