| 摘要 |
A compound of the formula II: wherein: R'<SUB>2 </SUB>is CHR''<SUB>2</SUB>, where R''<SUB>2 </SUB>is H. R<SUB>6 </SUB>and R<SUB>9 </SUB>are H and R<SUB>7 </SUB>is OMe and the compound is a dimer with each monomer being the same and being of formula II, where the R<SUB>8 </SUB>groups of the monomers form together a bridge having the formula -O-(CH<SUB>2</SUB>)<SUB>p</SUB>-O-, where p is 5, linking the monomers.
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