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

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

The Monomethylarsonic acid, with the CAS registry number 2163-80-6, is also known as Methanearsonic acid monosodium salt. It belongs to the product categories of Alpha sort; ArsenicPesticides&Metabolites; Herbicides; H-MAlphabetic; M; METI - MZ; Pesticides&Metabolites. Its EINECS registry number is 218-495-9. This chemical's molecular formula is CH₄AsNaO₃ and molecular weight is 161.96. Its IUPAC name is called sodium hydroxy(methyl)arsinate. This chemical's classification codes are Agricultural Chemical; Herbicide; Mutation data; Organometallic; Skin / Eye Irritant. It is odorless colorless solid. When you are using this chemical, please be cautious about it as the following. This chemical may cause damage to health. It is harmful if swallowed.

Physical properties of Monomethylarsonic acid: (1)ACD/LogP: -1.75; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -3.39; (4)ACD/LogD (pH 7.4): -4.98; (5)ACD/BCF (pH 5.5): 1; (6)ACD/BCF (pH 7.4): 1; (7)ACD/KOC (pH 5.5): 1; (8)ACD/KOC (pH 7.4): 1; (9)#H bond acceptors: 3; (10)#H bond donors: 2; (11)#Freely Rotating Bonds: 0; (12)Flash Point: 205.8 °C; (13)Enthalpy of Vaporization: 74.36 kJ/mol; (14)Melting Point: 113-116 °C; (15)Boiling Point: 393.3 °C at 760 mmHg; (16)Vapour Pressure: 8.17E-08 mmHg at 25°C.

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

The toxicity data is as follows: