Substansi kristal yang didapat dalam cairan allantois, urin fetus, dan banyak tumbuh-tumbuhan, dan sebagai produk ekskresi urin dari metabolisme purin dalam kebanyakan mamalia tetapi tidak dalam manusia atau kera tingkat tinggi; digunakan secara topikal untuk memulai penyembuhan luka.

Merriam-Webster Online Dictionary
allantoin (noun)
a crystalline oxidation product CHNO of uric acid used to promote healing of local wounds and infections - 4 6 4 3
Allantoin (Wikipedia)
"Paxyl" redirects here. For the antidepressant Paxil, see Paroxetine.
Skeletal formula of allantoin
Heap of white powder on a watch glass
Ball-and-stick model of the allantoin molecule
IUPAC name
(2,5-Dioxo-4-imidazolidinyl) urea
Other names
3D model (Jmol)
ECHA InfoCard 100.002.358
EC Number 202-592-8
RTECS number YT1600000
Molar mass 158.12 g·mol−1
Appearance colourless crystalline powder
Odor odorless
Density 1.45 g/cm3
Melting point 230 °C (446 °F; 503 K) (decomposes)
Boiling point 478 °C (892 °F; 751 K)
0.57 g/100 mL (25 °C)
4.0 g/100 mL (75 °C)
Solubility soluble in alcohol, pyridine, NaOH
insoluble in ethyl ether
log P -3.14
Acidity (pKa) 8.48
Safety data sheet Allantoin MSDS
NFPA 704
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g., canola oilHealth code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroformReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
Lethal dose or concentration (LD, LC):
> 5000 mg/kg (oral, rat)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Allantoin is a chemical compound with formula C4H6N4O3. It is also called 5-ureidohydantoin or glyoxyldiureide. It is a diureide of glyoxylic acid. Allantoin is a major metabolic intermediate in most organisms including animals, plants and bacteria and is produced as a degradation product of purine nucleobases by urate oxidase (or uricase) from uric acid.