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  1. Pyran - Wikipedia

  2. 吡喃 - 百度百科

  3. 吡喃 - 维基百科,自由的百科全书

  4. 吡喃 - 維基百科,自由的百科全書

  5. 芘(有机化合物)_百度百科

  6. 2H-Pyran, 3,4-dihydro- - NIST Chemistry WebBook

  7. 2H-Pyran, 3,4-dihydro- - NIST Chemistry WebBook

  8. Pyrans: Heterocycles of chemical and biological interest

  9. Emergence of 2-Pyrone and Its Derivatives, from Synthesis to Biological ...

  10. 2-Pyrone – A Privileged Heterocycle and Widespread Motif in …