1.Secondary in abundance are aromatic sester and sesquiterpenoid hydrocarbons,but aromatic diterpenoids, most of the regular PAH are found at trace levels only.
但芳香二萜类,大多数常规多环芳烃仅以微量形式存在。
2.The structures and activities of 35 sesquiterpenoid antitumor agents are discussed, and found that each compound must have an active group with a conjugated π-bond.