Fluorescein isothiocyanate (FITC) is a derivative of fluorescein used in wide-ranging applications including flow cytometry. FITC is the original fluorescein molecule functionalized with an isothiocyanate reactive group (-N=C=S), replacing a hydrogen atom on the bottom ring of the structure.
F 0481 (OTTO) Fluorescein 5(6)-isothiocyanate, mixture of 2 components, ≥90% (HPLC) Cas 27072-45-3 - used to detect proteins in gels and on nitrocellulose membranes and is a selective inhibitor of several membrane ATPases.