| http://www.w3.org/ns/prov#value | - most preferred: [0038] More preferably the nucleating agent of formula (III) has one of the following formulae (G) or (H): [0039] In these embodiments (A) to (H), [0040] each R1CO comprises a blocking group and in particular each R1 is independently selected from a hydrogen atom and an unsubstituted or substituted alkyl, aryl, alkoxy, aryloxy, alkoxy- or aryloxy-carbonyl and alkyl- or aryl-aminoca
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