Fluorescein 5-Isothiocyanate, Isomer 1 (~90%)

3326-32-7

May cause allergy or asthma symptoms or breathing difficulties if inhaled.

>95% (HPLC)

Oc1ccc2c(Oc3cc(O)ccc3C24OC(=O)c5cc(ccc45)N=C=S)c1

C21 H11 N O5 S

389.38

InChI=1S/C21H11NO5S/c23-12-2-5-16-18(8-12)26-19-9-13(24)3-6-17(19)21(16)15-4-1-11(22-10-28)7-14(15)20(25)27-21/h1-9,23-24H

IUPAC name: 3',6'-dihydroxy-6-isothiocyanatospiro[2-benzofuran-3,9'-xanthene]-1-one

Room Temperature

-20°C