• 

  Histidinol
• 

  Hydroxytyrosol
• 

  Indole
• 

  Methyl-DOPA
• 

  Protocatechuic acid
• 

  Protocatechuic aldehyde
• 

  Pyrroloquinoline quinone
• 

  Resveratrol
• 

  Salicylic acid
• 

  Sinapic acid
• 

  Vanillin