Molecular structure of 2,4-Dihydroxycinnamic acid (CAS NO.614-86-8) is:

Product Name: 2,4-Dihydroxycinnamic acid
CAS Registry Number: 614-86-8
IUPAC Name: (E)-3-(2,4-dihydroxyphenyl)prop-2-enoic acid
Molecular Weight: 180.15742 [g/mol]
Molecular Formula: C₉H₈O₄
XLogP3-AA: 1.2
H-Bond Donor: 3
H-Bond Acceptor: 4
Melting Point: 138-140 °C(lit.)
Surface Tension: 77.8 dyne/cm
Density: 1.478 g/cm³
Flash Point: 230.7 °C
Enthalpy of Vaporization: 72.79 kJ/mol
Boiling Point: 434.5 °C at 760 mmHg
Vapour Pressure: 2.56E-08 mmHg at 25°C
Product Categories: Fluoro-contained cinnamic acid series;Aromatic Cinnamic Acids, Esters and Derivatives;Cinnamic acid;Miscellaneous;Acids & Esters;Fluorine Compounds;C₉;Carbonyl Compounds;Carboxylic Acids

Safty information about 2,4-Dihydroxycinnamic acid (CAS NO.614-86-8) is:
Hazard Codes: Xi
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36-26/37/39 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing. 
S37/39:Wear suitable gloves and eye/face protection.
WGK Germany: 3
Hazard Note: Irritant
HazardClass: IRRITANT

 2,4-Dihydroxycinnamic acid , its cas register number is 614-86-8. It also can be called 2-Propenoic acid,3-(2,4-dihydroxyphenyl)- .It is a white crystalline powder.