prov:value
| - one or more carbon atoms can be replaced by O, C???O, ???O(C???O)???, SiR2 and/or NR, wherein R is an aliphatic radical having 1 to 7 carbon atoms, in which one or more carbon atoms can be replaced by O, C???O and/or ???O(C???O)???, B1, B2, D and E independently of one another denote a hydrogen atom or an aliphatic radical having 1 to 9 carbon atoms, wherein one or more carbon atoms can be replace
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