prov:value
| - hydroxyalkyl radicals, R3 is an alkyl, cycloalkyl, alkenyl, hydroxyalkyl or optionally substituted aralkyl radical containing a maximum of 20 carbon atoms, A1 and A2, which are identical or different, represent optionally substituted alkylene or arylene radicals which can contain up to 20 carbon atoms, Z=--SO2 -- or --CO--p, in which p=1 or 2, R6 and R7, which are identical or different, are hydro
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