C18H28O2
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The chemical formula C18H28O2 (molar mass : 276.41 g/mol exact mass : 276.20893) may refer to:

 Bolandiol (19-norandrostenediol)
 5α-Dihydronandrolone
 19-Norandrosterone
 19-Noretiocholanolone
 alpha-Parinaric acid
 Stearidonic acid, an essential fatty acid