IUPAC Name: 2-amino-3-hydroxy-3-oxopropane-1-thiolate; ethylmercury(1+) 
Empirical Formula: C₅H ₁₁HgNO₂S 
Molecular Weight: 349.8013g/mol
H-Bond Donor: 2
H-Bond Acceptor: 4
Rotatable Bond Count: 2
Exact Mass: 351.021675
MonoIsotopic Mass: 351.021675
Topological Polar Surface Area: 63.3
Heavy Atom Count: 10
Formal Charge: 0
Complexity: 78.1
Flash Point: 131.5 °C
Enthalpy of Vaporization: 58.69 kJ/mol
Boiling Point: 293.9 °C at 760 mmHg
Vapour Pressure: 0.000411 mmHg at 25°C
Canonical SMILES: CC[Hg+].C(C(C(=O)O)N)[S-]
InChI: InChI=1S/C3H7NO2S.C2H5.Hg/c4-2(1-7)3(5)6;1-2;/h2,7H,1,4H2,(H,5,6);1H2,2H3;/q;;+1/p-1
InChIKey: MFOMPYPCNUOFAE-UHFFFAOYSA-M
Structure of Ethylmercuric cysteine (CAS NO.21082-50-8):

Mercury and its compounds are on the Community Right-To-Know List.

Poison by subcutaneous route. Human mutation data reported. When heated to decomposition it emits very toxic fumes of NO_x, SO_x, and Hg. See also MERCURY COMPOUNDS, INORGANIC; MERCURY COMPOUNDS, ORGANIC.

OSHA PEL: TWA 0.01 mg(Hg)/m³; STEL 0.03 mg/m³ (skin)
ACGIH TLV: TWA 0.01 mg(Hg)/m³; BEI: 35 µg/g creatinine total inorganic mercury in urine preshift; 15 µg/g creatinine total inorganic mercury in blood at end of shift at end of workweek.
DFG MAK: Confirmed Animal Carcinogen with Unknown Relevance to Humans

 Ethylmercuric cysteine , its cas register number is 21082-50-8. It also can be called  Mercurate(1-), (L-cysteinato(2-)-N,S)ethyl-, hydrogen ; Mercury, ethyl(hydrogen cysteinato)- . When heated to decomposition it emits very toxic fumes of NO_x, SO_x, and Hg. And  Ethylmercuric cysteine (CAS NO.21082-50-8) is toxic if swallowed.