IUPAC Name: (2R)-2-(9H-Fluoren-9-ylmethoxycarbonylamino)-3-tritylsulfanylpropanoicacid 
Following is the structure of Fmoc-Cys(Trt)-OH (CAS NO.103213-32-7):
                              
Empirical Formula: C₃₇H₃₁NO₄S
Molecular Weight: 585.7113
Index of Refraction: 1.656
Molar Refractivity: 169.39 cm³
Molar Volume: 460.9 cm³
Density: 1.27 g/cm³
Flash Point: 415.5 °C
Storage temp.: 2-8 °C
Melting point: 170-173 °C(lit.)
Surface Tension: 56.7 dyne/cm
Enthalpy of Vaporization: 116.64 kJ/mol
Boiling Point: 763.4 °C at 760 mmHg
Vapour Pressure: 1.68E-24 mmHg at 25 °C 
Appearance of Fmoc-Cys(Trt)-OH (CAS NO.103213-32-7): white to light yellow crystal powde
Product Categories of Fmoc-Cys(Trt)-OH (CAS NO.103213-32-7): Pharmaceutical Intermediates; Fluorenes, Flurenones; Amino Acids; Cysteine [Cys, C]; Fmoc-Amino Acids and Derivatives; Amino Acids (N-Protected); Biochemistry; Fmoc-Amino Acids; Fmoc-Amino acid series
Canonical SMILES: C1=CC=C(C=C1)C(C2=CC=CC=C2)(C3=CC=CC=C3)SCC(C(=O)O)NC(=O)OCC4C5=CC=CC=C5C6=CC=CC=C46
Isomeric SMILES: C1=CC=C(C=C1)C(C2=CC=CC=C2)(C3=CC=CC=C3)SC[C@@H](C(=O)O)NC(=O)OCC4C5=CC=CC=C5C6=CC=CC=C46
InChI: InChI=1S/C37H31NO4S/c39-35(40)34(38-36(41)42-24-33-31-22-12-10-20-29(31)30-21-11-13-23-32(30)33)25-43-37(26-14-4-1-5-15-26,27-16-6-2-7-17-27)28-18-8-3-9-19-28/h1-23,33-34H,24-25H2,(H,38,41)(H,39,40)/t34-/m0/s1
InChIKey: KLBPUVPNPAJWHZ-UMSFTDKQSA-N

 Fmoc-Cys(Trt)-OH (CAS NO.103213-32-7) hasn't been listed as a carcinogen by ACGIH, IARC, NTP, or CA Prop 65. And the toxicological properties have not been fully investigated.

Hazard Codes: Xi
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 22-24/25-26 
S22:Do not breathe dust. 
S24/25:Avoid contact with skin and eyes. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
WGK Germany: 3
F: 9-21
Hazard Note: Irritant

 Fmoc-Cys(Trt)-OH , its cas register number is 103213-32-7. It also can be called 2-{[(9H-Fluoren-9-ylmethoxy)carbonyl]amino}-3-(tritylthio)propanoic acid; Fmoc-Cys(Trt)-OH .
 Fmoc-Cys(Trt)-OH (CAS NO.103213-32-7) could be stable. It should avoid the condition like incompatible materials. It is not compatible with strong oxidizing agents, acids, acid chlorides, carbon dioxide, acid anhydrides. And also prevent it to broken down into hazardous decomposition products: carbon monoxide, oxides of nitrogen, oxides of sulfur, carbon dioxide. However, its hazardous polymerization will not occur.