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[1] WieLiam T Read.et  al.J Am Chem Soe,1992,44:1-746
[2] Hauser C R et al.J Am Chem Soc.1948.70:426
[3] Granto C.et al.J Org Chem.1963.28:879
[4] Levine R.et al J Org Chem.1975.40:1-770
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