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ÎÄÏ×2 Kelly, Jeffery W.; Evans, Slayton A.; J.Org.Chem.. EN;26.1986,51,5490-5492.

ÎÄÏ×3 Cheng, Chien-Chung; Lu, Yen-Lin; Chem.Commun.. EN;2.1998,253-254.
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