Diazolidinyl urea

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Diazolidinyl urea
Diazolidinyl urea erroneous formula.png
IUPAC names
Correct new structure: 1-[3,4-bis(hydroxymethyl)-2,5-dioxoimidazolidin-4-yl]-1,3-bis(hydroxymethyl)urea
Erroneous old structure: 1-[1,3-bis(hydroxymethyl)-2,5-dioxoimidazolidin-4-yl]-1,3-bis(hydroxymethyl)urea
Other names
Germall II
78491-02-8 YesY
ChemSpider 56078 YesY
EC number 278-928-2
Jmol-3D images Image
PubChem 62277
Molar mass 278.22 g/mol
GHS pictograms Skin Sens. 1
GHS signal word WARNING
P261, P272, P280, P302+352, P333+313, P321, P363, P501
EU Index not listed
NFPA 704
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g., canola oil Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Related compounds
Related compounds
Imidazolidinyl urea
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Diazolidinyl urea is an antimicrobial preservative used in cosmetics. It is chemically related to imidazolidinyl urea which is used in the same way. Diazolidinyl urea acts as a formaldehyde releaser.

It is used in many cosmetics, skin care products, shampoos and conditioners, as well as a wide range of products including bubble baths, baby wipes and household detergents. Diazolidinyl urea is found in the commercially available preservative Germaben.

Commercial diazolidinyl urea is a mixture of different formaldehyde addition products including polymers.[2]



Diazolidinyl urea is produced by the chemical reaction of allantoin and formaldehyde in the presence of sodium hydroxide solution and heat. The reaction mixture is then neutralized with hydrochloric acid and evaporated:

Allantoin + 4 H2C=O → Diazolidinyl urea


Diazolidinyl urea was poorly characterized until recently and still has a wrong CAS structure assigned to it. New data show that the hydroxymethyl functional group of the imidazolidine ring is attached to the carbon, not the nitrogen atom:[2]

Diazolidinyl urea (correct new structure) Diazolidinyl urea (erroneous old structure)
Hoeck structure previous structure


Some people have a contact allergy to imidazolidinyl urea causing dermatitis.[3] Such people are often also allergic to diazolidinyl urea.

In 2005–06, it was the 14th-most-prevalent allergen in patch tests (3.7%).[4]


  1. ^ HSNO Chemical Classification Information Database, New Zealand Environmental Risk Management Authority, retrieved 2009-09-06 
  2. ^ a b Lehmann, Søren Vig; Hoeck, Ulla; Breinholdt, Jens; Olsen, Carl Erik; Kreilgaard, Bo (2006). "Characterization and chemistry of imidazolidinyl urea and diazolidinyl urea". Cont. Dermat. 54 (1): 50–58. doi:10.1111/j.0105-1873.2006.00735.x. PMID 16426294. 
  3. ^ Review of toxicological data (NTP NIEHS)
  4. ^ Zug KA, Warshaw EM, Fowler JF Jr, Maibach HI, Belsito DL, Pratt MD, Sasseville D, Storrs FJ, Taylor JS, Mathias CG, Deleo VA, Rietschel RL, Marks J. Patch-test results of the North American Contact Dermatitis Group 2005–2006. Dermatitis. 2009 May–Jun;20(3):149-60.