Molecule structure of Permanganic acid, ammonium salt (CAS NO.13446-10-1):

IUPAC Name: Azanium permanganate 
Molecular Weight: 136.974109 g/mol
Molecular Formula: H₄MnNO₄
H-Bond Donor: 1
H-Bond Acceptor: 4 
Exact Mass: 136.952082
MonoIsotopic Mass: 136.952082
Topological Polar Surface Area: 75.3
Heavy Atom Count: 6
Complexity: 95.8
Canonical SMILES: [NH4+].[O-][Mn](=O)(=O)=O
InChI: InChI=1S/Mn.H3N.4O/h;1H3;;;;/q;;;;;-1/p+1
InChIKey: PASCZIGWJWZUOV-UHFFFAOYSA-O

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

Probably an irritant. A powerful oxidizer. Moderately flammable by chemical reaction with reducing agents. Explosive when shocked or warmed to 60°. Can be exploded by percussion. When heated to decomposition it emits toxic fumes of NO_x and NH₃. Incompatible with reducing material, friction. When heated to decomposition it emits toxic fumes of NO_x and NH₃. See also PERMANGANATES and MANGANESE COMPOUNDS.
RIDADR: 0473
HazardClass: 1.1A
PackingGroup: I

OSHA PEL: CL 5 mg(Mn)/m³
ACGIH TLV: TWA 5 mg(Mn)/m³

 Permanganic acid, ammonium salt (CAS NO.13446-10-1) is also called Ammonium permanganate ; Permanganic acid (HMnO4), ammonium salt . Permanganic acid, ammonium salt (CAS NO.13446-10-1) is a crystal or powder with a rich violet-brown or dark purple metallic sheen. It is toxic by ingestion or inhalation of dust. Permanganic acid, ammonium salt (CAS NO.13446-10-1) is soluble in water. Dry Permanganic acid, ammonium salt (CAS NO.13446-10-1) may explode on shock, friction or heating. Mixtures with acetic acid or acetic anhydride may explode if not kept cold. Explosions can occur when permanganates that have been treated with sulfuric acid come in contact with benzene, carbon disulfide, diethyl ether, ethyl alcohol, petroleum, or organic matter.