Mercury and its compounds, as well as cyanide and its compounds, are on the Community Right-To-Know List.

OSHA PEL: CL 0.1 mg(Hg)/m³ (skin)
ACGIH TLV: TWA 0.1 mg(Hg)/m³ (skin); 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.
NIOSH REL: (Mercury, Aryl and Inorganic) CL 0.1 mg/m³ (skin)
DOT Classification:  Forbidden; DOT Class: 6.1; Label: Poison (desensitized)

The CAS registry number of Mercury cyanide oxide is 1335-31-5. The IUPAC name is methyl dicyanomercury; oxomercury. Its EINECS registry number is 215-629-8. In addition, the molecula formula is C₂Hg₂N₂O and the molecular weight is 469.2142. It is extremely harmful to water, even a small amount infiltrate to underground water which can cause harm to the drinking water. If anarchic license, do not put this material into surroundings.

Physical properties about this chemical are: (1)#H bond acceptors: 3; (2)#H bond donors: 0; (3)#Freely Rotating Bonds: 0; (4)Polar Surface Area: 64.65 Å²; (5)H-Bond Donor: 0; (6)H-Bond Acceptor: 3; (7)Rotatable Bond Count: 0; (8)Exact Mass 469.939998; (9)MonoIsotopic Mass: 471.942315; (10)Topological Polar Surface Area: 64.6; (11)Heavy Atom Count: 7; (12)Formal Charge: 0; (13)Complexity:  87.3; (14)Isotope Atom Count: 0; (15)Defined Atom StereoCenter Count: 0; (16)Undefined Atom StereoCenter Count: 0; (17)Defined Bond StereoCenter Count: 0; (18)Undefined Bond StereoCenter Count 0; (19)Covalently-Bonded Unit Count 2.

Preparation and uses of Mercury cyanide oxide: it can be prepared by saturated mercury cyanide solution and oxidation mercury. The excessive oxidation (Ⅱ) mercury can react with hydrocyanic acid. It can be used in medicine.

When you are using this chemical, please be cautious about it as the following:
It has extreme risk of explosion by shock, friction, fire or other sources of ignition. It is toxic by inhalation, in contact with skin and if swallowed and very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. It also has danger of cumulative effects. This material and its container must be disposed of in a safe way. If it contacts with skin, you must wash immediately with plenty of soap-suds. In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.). You should avoid release to the environment. And you should refer to special instructions/safety data sheets.

You can still convert the following datas into molecular structure:
(1)SMILES: N#C[Hg]C#N.[Hg]=OO
(2)InChI: InChI=1/2CN.2Hg.O/c2*1-2;;;/rC2HgN2.HgO/c4-1-3-2-5;1-2
(3)InChIKey: FWJGYFKCKCRGIV-KEOMXQQYAH

The toxicity data is as follows: