EPA Genetic Toxicology Program. Arsenic and its compounds are on the Community Right-To-Know List.

OSHA PEL: TWA 0.5 mg(As)/m³
ACGIH TLV: BEI: 35 µ (As)/L inorganic arsenic and methylated metabolites in urine

The Disodium methanearsenate is an organic compound with the formula CH₃AsNa₂O₃. The systematic name of this chemical is disodium methylarsonate. With the CAS registry number 144-21-8, it is also named as arsonic acid, As-methyl-, sodium salt (1:2). The product's categories are Alpha Sort; Arsenic Pesticides & Metabolites; D; DAlphabetic; DIO - DIZ; Herbicides; Pesticides & Metabolites.

Physical properties about Disodium methanearsenate are: (1)ACD/LogP: -1.75; (2)ACD/LogD (pH 5.5): -3.39; (3)ACD/LogD (pH 7.4): -4.98; (4)ACD/BCF (pH 5.5): 1; (5)ACD/BCF (pH 7.4): 1; (6)ACD/KOC (pH 5.5): 1; (7)ACD/KOC (pH 7.4): 1; (8)#H bond acceptors: 3; (9)#H bond donors: 2; (10)Polar Surface Area: 57.53 Å²; (11)Flash Point: 205.8 °C; (12)Enthalpy of Vaporization: 74.36 kJ/mol; (13)Boiling Point: 393.3 °C at 760 mmHg; (14)Vapour Pressure: 8.17E-08 mmHg at 25°C.

When you are using this chemical, please be cautious about it as the following:
It is if swallowed. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

You can still convert the following datas into molecular structure:
(1)SMILES: [Na+].[Na+].[O-][As]([O-])(=O)C
(2)InChI: InChI=1/CH5AsO3.2Na/c1-2(3,4)5;;/h1H3,(H2,3,4,5);;/q;2*+1/p-2
(3)InChIKey: SDIXRDNYIMOKSG-NUQVWONBAA
(4)Std. InChI: InChI=1S/CH5AsO3.2Na/c1-2(3,4)5;;/h1H3,(H2,3,4,5);;/q;2*+1/p-2
(5)Std. InChIKey: SDIXRDNYIMOKSG-UHFFFAOYSA-L

The toxicity data is as follows: