| http://www.w3.org/ns/prov#value | - Compounds of the formula I in which R1 does not represent hydrogen or a cation can be hydrolyzed in an alkaline medium to give compounds of the formula I in which R1 denotes hydrogen or a cation, for example using NaOH or KOH in a low-molecular weight alcohol, such as methanol, or in ethers, such as dimethoxyethane or tetrahydrofuran, if appropriate in the presence of water.
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