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editG.Gogte, Proc.Indian Acad.Sci., 7A., 214(1938); from N P Shusherina et al 1967 Russ. Chem. Rev. 36 175-192 doi:10.1070/RC1967v036n03ABEH001596 --Stone (talk) 22:31, 12 March 2008 (UTC)
- coumarin should not be included in this group. ]] 15:23, 1 User:حسن علي البط]] April 2010 (UTC)