The molecular formula C18H18O3 may refer to:
- Erteberel (SERBA-1), a synthetic, nonsteroidal estrogen which acts as a selective ERβ agonist
 - Obovatol, a biphenolic anti-inflammatory, anxiolytic, and nootropic
 - SERBA-2, a synthetic, nonsteroidal estrogen which acts as a selective ERβ agonist
 
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