| http://www.w3.org/ns/prov#value | - E2C-E4C are each, independently of one another, carbon, nitrogen or phosphorus, in particular carbon, R1C-R3Care each, independently of one another, hydrogen, C1-C22-alkyl, C2-C22-alkenyl, C6 -C22-aryl, alkylaryl having from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms in the aryl part, halogen, NR18C 2, OR18C 2, SiR19C 3, where the organic radicals R1C-R3C may also be substituted
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