IUPAC Name: azetidine-3-carboxylic acid 
Empirical Formula: C₄H₇NO₂
Molecular Weight: 101.1039g/mol
Structure of 3-Azetidinecarboxylic acid (CAS NO.36476-78-5):

Index of Refraction: 1.499
Molar Refractivity: 23.29 cm³
Molar Volume: 79.2 cm³
Polarizability: 9.23×10^-24cm³
Surface Tension: 48.2 dyne/cm
Density: 1.275 g/cm³
Flash Point: 100.1 °C
Enthalpy of Vaporization: 52.75 kJ/mol 
Melting Point: 286 °C (dec.)(lit.)
Boiling Point: 242 °C at 760 mmHg
Vapour Pressure: 0.0116 mmHg at 25°C 
Product Categories: Pharmaceutical Raw Materials;Unusual amino acids;Heterocycles series;Miscellaneous;Carboxylic Acids;Amino Acids 13C, 2H, 15N;Azetidines;Simple 4-Membered Ring Compounds;Peptide;Amino Acids & Derivatives;Carboxylic Acids;Ring Systems;Alicyclic Amino Acids;Peptide Synthesis;Unnatural Amino Acid Derivatives;B-Amino 
Canonical SMILES: C1C(CN1)C(=O)O
InChI: InChI=1S/C4H7NO2/c6-4(7)3-1-5-2-3/h3,5H,1-2H2,(H,6,7)
InChIKey: GFZWHAAOIVMHOI-UHFFFAOYSA-N

A useful intermediate in the synthesis of polypeptides.

Low toxicity by ingestion and skin contact. When heated to decomposition it emits toxic vapors of NO_x.
Hazard Codes:  Xi
The Risk Statements information of  3-AZETIDINECARBOXYLIC ACID:
36/37/38:  Irritating to eyes, respiratory system and skin 
The Safety Statements information of  3-AZETIDINECARBOXYLIC ACID :
22:  Do not breathe dust 
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice 
36:  Wear suitable protective clothing 
24/25:  Avoid contact with skin and eyes 
WGK Germany:3
Hazard Note:Irritant

  3-Azetidinecarboxylic acid , its cas register number is 36476-78-5. It also can be called 3-Carboxyazetidine ; 5-22-01-00023 (Beilstein Handbook Reference) ; Azetidine-3-carboxylic acid ; CHA-811 ; Caswell No. 063C ; EPA Pesticide Chemical Code 128830 . 3-Azetidinecarboxylic acid (CAS NO.36476-78-5) is a light yellow powder.