| http://www.w3.org/ns/prov#value | - r alkylcarbonyloxy (with a C1 to C4 alkyl part) radicals andR6 represents a carboxylic acid group or a salt which this group can form with an inorganic base with a primary, secondary or tertiary amine ##STR68## group in which R7 is a C1 to C4 alkyl radical,
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