The molecular formula C₁₈H₁₈O₂ (molar mass 266.33 g/mol, exact mass 266.13068) may refer to:

• Dienestrol, a synthetic estrogen
• 2,8-Dihydroxyhexahydrochrysene, a synthetic estrogen
• Equilenin, a horse steroid
• Honokiol, a lignan
• Juncusol, a 9,10-dihydrophrenathrene found in Juncus species
• Magnolol, a lignan

Index of chemical compounds with the same molecular formula

This set index page lists chemical structure articles associated with the same molecular formula.
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