| abstract |
The present invention relates to an alkaline earth metal salt or an organic amine salt of a compound represented by formula [I]: in which R1 is each a hydrogen atom, a halogen atom, or an optionally substituted linear hydrocarbon group; ring A is optionally an optionally substituted benzene ring; B is, optionally, a substituted benzene ring; R is a carboxyl group or a linear hydrocarbon group substituted by a carboxyl group. |