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Synthetic Studies on Lignans and Related Compounds. VIII. Synthesis of Justicidin B and Diphyllin and of Taiwanin C and E From 2,3-Dibenzylidenebutyrolactones via .BETA.-apolignans: A Chemical Model for Natural Co-Occurrence of 4-Hydrogen- And 4-Hydroxy-1-Phenyl-2,3-Naphthalides in Plants.