Molecular structure of 2-Phthalimidopropionic acid (CAS NO.21860-84-4) is:

Product Name: 2-Phthalimidopropionic acid
CAS Registry Number: 21860-84-4
IUPAC Name: 2-(1,3-dioxoisoindol-2-yl)propanoic acid
Molecular Weight: 219.19346 [g/mol]
Molecular Formula: C₁₁H₉NO₄
XLogP3: 1.3
H-Bond Donor: 1
H-Bond Acceptor: 4
Melting Point: 162-164°C
Surface Tension: 68.4 dyne/cm
Density: 1.467 g/cm³
Flash Point: 200.5 °C
Enthalpy of Vaporization: 69.57 kJ/mol
Boiling Point: 407.9 °C at 760 mmHg
Vapour Pressure: 2.2E-07 mmHg at 25°C
Product Categories: Aromatic Propionic Acids;N-Substituted Maleimides, Succinimides & Phthalimides;N-Substituted Phthalimides

Safty information about 2-Phthalimidopropionic acid (CAS NO.21860-84-4) is:
Hazard Codes: Xi
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing.
Hazard Note: Irritant

 2-Phthalimidopropionic acid , its cas register number is 21860-84-4. It also can be called N-Phthaloyl-DL-alanine ; 2-(1,3-Dioxo-1,3-dihydro-2H-isoindol-2-yl)propanoic acid .It is a white crystalline powder.