N-(5-AMinopentyl)-N'-(3',6'-dihydroxy-3-oxospiro[isobenzofuran-1(3H),9'-[9H]xanthen]-5-yl)thiourea DihydrobroMide

N-(5-AMinopentyl)-N'-(3',6'-dihydroxy-3-oxospiro[isobenzofuran-1(3H),9'-[9H]xanthen]-5-yl)thiourea DihydrobroMide is a fluorescein derivative used in the preparation of biologically active fluorescent-labeled vitamin K analogues and monitoring of their subcellular distribution.