prov:value
| - where A1 in the formulae XIII.a to XIII.t may also be a C2- or C3-alkylene bridge which may contain a double bond and/or bear an alkyl, cycloalkyl, heterocycloalkyl, aryl or hetaryl substituent or be interrupted by O, S, SiR51R52 or NR53, D is a divalent bridging group selected from among the groups where R61 and R62 are each, independently of one another, hydrogen, alkyl, cycloalkyl, aryl, haloge
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