Fura-2-acetoxymethyl ester

Fura-2-acetoxymethyl ester, often abbreviated Fura-2AM, is a ratiometric calcium indicator used in biochemistry, measured by changes in fluorescence. Fura-2AM is a membrane-permeable derivative of Fura-2.

Measurement of Ca+2-induced fluorescence at both 340 nm and 380 nm allows for 340/380 ratios. This helps in cancellation of artifacts produced by changes in dye concentrations.