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== Structure, properties and matrices ==
[[File:Creatinine-tautomerism-2D-skeletal.png.crdownload.png|thumb|250px|Types Tautomer forms of gliacreatinine]]
'''Creatinine''' is an organic compound characterized by the chemical formula C<sub>4</sub>H<sub>7</sub>N<sub>3</sub>O with a total molar mass of 113.12 g/mol and a density of 1.09 g/cm<sup>3</sup>. The solubility of creatinine in water is 90 mg/ml at 20°C. The molecule can tautomerize.<ref name="WikiCreat">Creatinine (last modified 23 March 2016), Wikipedia (Encyclopedia), retrieved from https://en.wikipedia.org/wiki/Creatinine, consulted on 12 May 2016</ref> Anhydrous creatinine is a solid substance and generally considered as non-hazardous.<ref name="SigmaCreat">SAFETY DATA SHEET Creatinine, Sigma-Aldrich, 21 December 2015, retrieved on 29 may 2016 from http://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?country=NL&language=EN-generic&productNumber=C4255&brand=SIAL&PageToGoToURL=http%3A%2F%2Fwww.sigmaaldrich.com%2Fcatalog%2Fproduct%2Fsial%2Fc4255%3Flang%3Den</ref>