p. 4867 - 4875
(2021/09/14)(2019/04/27)
p. 3928 - 3932
(2018/07/25)p. 582 - 588
(2010/09/05)p. 987 - 990
(2007/10/03)(2008/06/13)
(2008/06/13)
ethyl 4-oxo-4H-1-benzopyran-2-carboxylate
o-hydroxyacetophenone
chroman-2-carboxylic acid
sulfuric acid
ethanol