The molecular formula C16H18O9 may refer to:
- Chlorogenic acid (3-O-caffeoylquinic acid or 3-CQA)
 - Cryptochlorogenic acid (4-O-caffeoylquinic acid or 4-CGA)
 - Neochlorogenic acid (5-O-caffeoylquinic acid or 5-CQA)
 - Scopolin
 
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