Empirical Formula: C₂₁H₁₁NO₅S
Molecular Weight: 389.3807 
Einecs: 248-207-7 
Freely Rotating Bonds: 3
Polar Surface Area: 98.44 Å²
Index of Refraction: 1.753
Molar Refractivity: 102.82 cm³
Molar Volume: 251.5 cm³
Polarizability: 40.76×10^-24 cm³
Surface Tension: 63.4 dyne/cm
Density: 1.54 g/cm³
Flash Point: 382.4 °C
Enthalpy of Vaporization: 107.34 kJ/mol
Boiling Point: 708.6 °C at 760 mmHg
Vapour Pressure: 9.53E-21 mmHg at 25°C 
The Cas Register Number of  Fluorescein isothiocyanate is 27072-45-3.The chemical synonyms of  Fluorescein isothiocyanate (CAS NO.27072-45-3) are 3',6'-Dihydroxy-5(or 6)-isothiocyanatospiro(isobenzofuran-1(3H),9'-(9H)xanthene)-3-one  and Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 3',6'-dihydroxy-5(or 6)-isothiocyanato- .The molecular structure of  Fluorescein isothiocyanate (CAS NO.27072-45-3) is
.

  Fluorescein isothiocyanate (CAS NO.27072-45-3) is used in wide-ranging applications including flow cytometry.

Hazard Codes: Xn
Risk Statements: 42/43-36/37/38-20/21/22-42 
R42/43: May cause sensitization by inhalation and skin contact. 
R36/37/38: Irritating to eyes, respiratory system and skin. 
R20/21/22: Harmful by inhalation, in contact with skin and if swallowed. 
R42: May cause sensitization by inhalation.
Safety Statements: 22-36-26 
S22: Do not breathe dust. 
S36: Wear suitable protective clothing. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
WGK Germany: 3
F: 10