Product Name: Melarsonyl potassium [INN:BAN:DCF] 
CAS Registry Number: 13355-00-5
Synonyms: EINECS 236-405-6 ; MEL W ; Melarsonil potasico ; Melarsonil potasico [INN-Spanish] ; Melarsonyl potassique ; Melarsonyl potassique [INN-French] ; Melarsonyl potassium salt ; Potassium 2-(p-((4,6-diamino-s-triazin-2-yl)amino)phenyl)-1,3,2-dithiarsolane-4,5-dicarboxylate ; Potassium melarsonyl ; Potassium pentyl thiarsaphenylmelamine ; RP 9955 ; Trimelarsen ; 1,3,2-Dithiarsolane-4,5-dicarboxylic acid, 2-(p-((4,6-diamino-s-triazin-2-yl)amino)phenyl)-, dipotassium salt ; Melarsonyl potassium 
IUPAC Name: dipotassium2-[4-[(4,6-diamino-1,3,5-triazin-2-yl)amino]phenyl]-1,3,2-dithiarsolane-4,5-dicarboxylate 
Molecular Weight: 532.51244 [g/mol]
Molecular Formula: C₁₃H₁₁AsK₂N₆O₄S₂
H-Bond Donor: 3
H-Bond Acceptor: 10 
Flash Point: 468.1 °C
Enthalpy of Vaporization: 129.5 kJ/mol
Boiling Point: 850.4 °C at 760 mmHg
Vapour Pressure: 9.21E-31 mmHg at 25°C
Following is the molecular structure of Melarsonyl potassium [INN:BAN:DCF] (CAS NO.13355-00-5) is:

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

Poison by intravenous route. Experimental reproductive effects. When heated to decomposition it emits toxic fumes of SO_x, NO_x, K₂O, and As. See also ARSENIC COMPOUNDS.

Descriptors computed from structure, you can know some information about Melarsonyl potassium [INN:BAN:DCF] (CAS NO.13355-00-5) :
Canonical SMILES: C1=CC(=CC=C1NC2=NC(=NC(=N2)N)N)[As]3SC(C(S3)C(=O)[O-])C(=O)[O-].[K+].[K+]
InChI: InChI=1S/C13H13AsN6O4S2.2K/c15-11-18-12(16)20-13(19-11)17-6-3-1-5(2-4-6)14-25-7(9(21)22)8(26-14)10(23)24;;/h1-4,7-8H,(H,21,22)(H,23,24)(H5,15,16,17,18,19,20);;/q;2*+1/p-2
InChIKey: PHCMFHVCRUCADN-UHFFFAOYSA-L