Molecule structure of Tetrakis(hydroxymethyl)phosphonium sulfate (CAS NO.55566-30-8): 

IUPAC Name: Tetrakis(hydroxymethyl)phosphanium sulfate 
Molecular Weight: 406.281482 g/mol
Molecular Formula: C₈H₂₄O₁₂P₂S 
Density: 1.4 g/mL at 25 °C(lit.)
Melting Point: -35 °C
Boiling Point: 111 °C
Flash Point: 96 °C
Water Solubility: >=10 g/100 mL at 18 °C
H-Bond Donor: 8
H-Bond Acceptor: 12
Rotatable Bond Count: 8
Exact Mass: 406.04637
MonoIsotopic Mass: 406.04637
Topological Polar Surface Area: 242
Heavy Atom Count: 23
Canonical SMILES: C(O)[P+](CO)(CO)CO.C(O)[P+](CO)(CO)CO.[O-]S(=O)(=O)[O-]
InChI: InChI=1S/2C4H12O4P.H2O4S/c2*5-1-9(2-6,3-7)4-8;1-5(2,3)4/h2*5-8H,1-4H2;(H2,1,2,3,4)/q2*+1;/p-2
InChIKey: YIEDHPBKGZGLIK-UHFFFAOYSA-L
EINECS: 259-709-0
Product Categories: Phosphonium Salts;Industrial/Fine Chemicals;Phosphonium Compounds;Biocide

IARC Cancer Review: Group 3 IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 48 ,1990,p. 95.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Inadequate Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 48 ,1990,p. 95.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) . Reported in EPA TSCA Inventory.

Hazard Codes: C
Risk Statements: 22-34-43 
R22:Harmful if swallowed. 
R34:Causes burns. 
R43:May cause sensitization by skin contact.
Safety Statements: 26-36/37/39-45 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
RIDADR: UN 2922 8/PG 3
WGK Germany: 1
RTECS: TA2570000
HazardClass: 6.1(b)
PackingGroup: III
A poison by ingestion. Mutation data reported. Questionable carcinogen. When heated to decomposition TETRAKIS(HYDROXYMETHYL)PHOSPHONIUM SULFATE(55566-30-8)  emits very toxic fumes of PO_x and SO_x. See also SULFATES.

 Tetrakis(hydroxymethyl)phosphonium sulfate (CAS NO.55566-30-8) is also named as Bis(tetrakis(hydroxymethyl)phosphonium)sulfate (salt) ; CCRIS 316 ; HSDB 4215 ; NCI-C55050 ; Octakis(hydroxymethyl)phosphonium sulfate ; Phosphonium, tetrakis(hydroxymethyl)-, sulfate (2:1) (salt) ; Pyroset TKO ; THPS ; Phosphonium, tetrakis(hydroxymethyl)-, sulfate (2:1) . Tetrakis(hydroxymethyl)phosphonium sulfate (CAS NO.55566-30-8) is clear colorless viscous liquid. It is water soluble. Tetrakis(hydroxymethyl)phosphonium sulfate is incompatible with oxidizing materials and alkalis. It is probably combustible.