IUPAC Name: Thallium(1+) formate 
Following is the structure of Formic acid,thallium(1+) salt (1:1) (CAS NO.992-98-3):
                                     
Empirical Formula: CHO₂Tl
Molecular Weight: 249.4007
EINECS: 213-599-0
Flash Point: 29.9 °C
Enthalpy of Vaporization: 22.69 kJ/mol
Boiling Point: 100.6 °C at 760 mmHg
Vapour Pressure of Formic acid,thallium(1+) salt (1:1) (CAS NO.992-98-3): 36.5 mmHg at 25 °C
Appearance of Formic acid,thallium(1+) salt (1:1) (CAS NO.992-98-3): light gray Crystalline powder
Canonical SMILES: C(=O)[O-].[Tl+]
InChI: InChI=1S/CH2O2.Tl/c2-1-3;/h1H,(H,2,3);/q;+1/p-1
InChIKey: UESISTHQAYQMRA-UHFFFAOYSA-M

 Formic acid,thallium(1+) salt (1:1) (CAS NO.992-98-3) 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: T+,N
Risk Statements: 26/28-33-51/53 
R26/28:Very toxic by inhalation and if swallowed. 
R33:Danger of cumulative effects. 
R51/53:Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements: 13-28-45-61 
S13:Keep away from food, drink and animal foodstuffs. 
S28:After contact with skin, wash immediately with plenty of soap-suds. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S61:Avoid release to the environment. Refer to special instructions / safety data sheets.
RIDADR: UN 1707 6.1/PG 2
WGK Germany: 3
TSCA: Yes
HazardClass: 6.1(a)
PackingGroup: II

 Formic acid,thallium(1+) salt (1:1) , its cas register number is 992-98-3. It also can be called Thallium formate TlO2CH ; Thallium(I) formate ; and Thallous formate .
 Formic acid,thallium(1+) salt (1:1) (CAS NO.992-98-3) could be stable under normal temperatures and pressures. It absorbs moisture or water from the air. It should avoid the condition like incompatible materials, exposure to moist air or water. It is not compatible with strong oxidizing agents. And also prevent it to broken down into hazardous decomposition products: carbon monoxide, carbon dioxide. However, its hazardous polymerization has not been reported.