The Molecular Structure of Imidurea (CAS NO.39236-46-9):

Empirical Formula: C₁₁H₁₆N₈O₈
Molecular Weight: 388.2935 
Appearance: solid with a mild odour
Nominal Mass: 388 Da
Average Mass: 388.2935 Da
Monoisotopic Mass: 388.10911 Da 
Index of Refraction: 1.714
Molar Refractivity: 82.29 cm³
Molar Volume: 209.5 cm³
Storage temp: 2-8°C
Water Solubility: soluble
Stability: Stable
InChI
InChI=1/C11H16N8O8/c20-2-18-4(6(22)16-10(18)26)14-8(24)12-1-13-9(25)15-5-7(23)17-11(27)19(5)3-21/h4-5,20-21H,1-3H2,(H2,12,14,24)(H2,13,15,25)(H,16,22,26)(H,17,23,27)
Smiles
N1([C@@H](C(NC1=O)=O)NC(NCNC(N[C@@H]1N(C(=O)NC1=O)CO)=O)=O)CO 
Synonyms: EINECS 254-372-6 ; Germall 115  
IUPAC Name: 1-[(4S)-3-(hydroxymethyl)-2,5-dioxoimidazolidin-4-yl]-3-[[[(4R)-3-(hydroxymethyl)-2,5-dioxoimidazolidin-4-yl]carbamoylamino]methyl]urea    

With parabens, Imidurea (CAS NO.39236-46-9) provides a broad spectrum of activity against bacteria, yeast, and mold. It has made the Germall 115-paraben combination one of the most widely used cosmetic reservative systems in the world.

  Imidurea can be 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.
Reaction of the process:
   

Reported in EPA TSCA Inventory.

Moderately toxic by intraperitoneal route. Mildly toxic by ingestion. When heated to decomposition it emits toxic fumes of NO_x.Some people,those often also allergic to diazolidinyl urea, have a contact allergy to GERMALL 115(imidazolidinyl urea )causing dermatitis. 
Hazard Codes: Xi
Risk Statements: 36 
R36:Irritating to eyes
Safety Statements: 26-36 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
S36:Wear suitable protective clothing
WGK Germany: 2
RTECS: YT7365000

 Imidurea (CAS NO.39236-46-9) is also called as N,N''-Methylenebis(N'-(3-(hydroxymethyl)-2,5-dioxo-4-imidazolidin- yl)urea ; Urea, N,N''-methylenebis(N'-(3-(hydroxymethyl)-2,5-dioxo-4-imidazolidin- yl)- ; 1,1'-Methylenebis(3-(3-(hydroxymethyl)-2,5-dioxo-4-imidazolidinyl)urea) ; Imidazolidinyl urea ; Methanebis(N,N'-(5-ureido-2,4-diketotetrahydroimidazole)-N,N-dimethylol) ; N,N'-Methylenebis(N'-(3-(hydroxymethyl)-2,5-dioxo-4-imidazolidinyl)urea) ; UNII-M629807ATL ; N,N''-Methylenebis(N'-(1-(hydroxymethyl)-2,5-dioxo-4-imidazolidinyl)urea) ; N,N''-Methylenebis(N'-(3-(hydroxymethyl)-2,5-dioxoimidazolidin-4-yl)urea) ; Urea, N,N''-methylenebis(N'-(1-(hydroxymethyl)-2,5-dioxo-4-imidazolidinyl)- ; Urea, N,N''-methylenebis(N'-(3-(hydroxymethyl)-2,5-dioxo-4-imidazolidinyl)- ; Imidazolinidyl urea .