环芬是由一个或多个芳环和一条或多条碳链或仅为一个键组成的环外有环的多环烃型有机化合物。

• 芳芬（Arylophane）
  • 环芬（Cyclophane）：芳环为苯
  • 萘芬（Naphthalenophane）：芳环为萘
• 其他芬

A cyclophane is a hydrocarbon consisting of an aromatic unit (typically a benzene ring) and an aliphatic chain that forms a bridge between two non-adjacent positions of the aromatic ring. More complex derivatives with multiple aromatic units and bridges forming cagelike structures are also known. Cyclophanes are well-studied in organic chemistry because they adopt unusual chemical conformations due to build-up of strain. Despite this, cyclophane structures are not unknown to biomolecules.