prov:value
| - It is preferred for R.sub.2 to represent a hydrogen atom, a methyl group or a carboxymethyl group.Specific examples of compounds represented by the formula (I) include the following compounds.(1) 1-Phosphonopropane-1,2,3-tricarboxylic acid(2) 1-Phosphonobutane-2,3,4-tricarboxylic acid(3) 1,1-Diphosphonopropane-2,3-dicarboxylic acid(4) 2-Phosphonobutane-2,3,4-tricarboxylic acid(5) 2,2-Diphosphonobu
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