α-Naphthyl Acid Phosphate, Monosodium Salt, a product of kinase-mediated phosphorylation of 1-naphthol in the cell, is recognized as an alkaline, acid, and protein phosphatase inhibitor. This compound has also been shown to dephosphorylate the actin-depolymerizing protein, Cofilin 1, in platelets. Other studies suggest that α-Naphthyl Acid Phosphate may decrease Ca²⁺-induced secretion in streptolysic O (SLO)-permeabilized chief cells from guinea pig stomach.

Non-specific phosphatase inhibitor. Inhibits acid, alkaline and protein phosphatases.