Molecular structure of Phenyl 1,4-dihydroxy-2-naphthoate (CAS NO.54978-55-1) is:

Product Name: Phenyl 1,4-dihydroxy-2-naphthoate
CAS Registry Number: 54978-55-1
IUPAC Name: Phenyl 1,4-dihydroxynaphthalene-2-carboxylate
Molecular Weight: 280.27478 [g/mol]  
Molecular Formula: C₁₇H₁₂O₄  
XLogP3-AA: 4.4  
H-Bond Donor: 2  
H-Bond Acceptor: 4
Melting Point: 156 °C
Index of Refraction: 1.708 
Molar Refractivity: 79.5 cm³ 
Molar Volume: 203.8 cm³
Surface Tension: 64.9 dyne/cm 
Density: 1.375 g/cm³ 
Flash Point: 191.8 °C 
Enthalpy of Vaporization: 80.44 kJ/mol 
Boiling Point: 505.4 °C at 760 mmHg 
Vapour Pressure: 7.76E-11 mmHg at 25 °C 
EINECS: 259-419-4
Product Categories: Intermediates of Dyes and Pigments;Naphthalene derivatives

Safty information about Phenyl 1,4-dihydroxy-2-naphthoate (CAS NO.54978-55-1) is:
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36/37/39 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection.

 Phenyl 1,4-dihydroxy-2-naphthoate , its cas register number is 54978-55-1. It also can be called 2-Naphthalenecarboxylicacid, 1,4-dihydroxy-, phenyl ester .It is a yellow powder.