| 摘要 |
The present invention relates to a sodium salt represented by average formula (I): (wherein, m<SUB>1</SUB>, n<SUB>1</SUB>, m<SUB>2 </SUB>and n<SUB>2 </SUB>respectively and independently represent a positive number of 0 0r 2 or less, provided that m<SUB>1</SUB>+n<SUB>1</SUB>=2, m<SUB>2</SUB>+n<SUB>2</SUB>=2, 0<M<SUB>1</SUB>+m<SUB>2</SUB><4 AND 0<N<SUB>1</SUB>+n<SUB>2</SUB><4), a method for producing the same, and a method for inhibiting decomposition of a sodium salt represented by general formula (IV): [CHEMICAL 4] comprising: having the sodium salt represented by general formula (IV) in the presence of the sodium salt represented by average formula (I), and according to the present invention the stability over time of the sodium salt represented by general formula (IV) is improved.
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