prov:value
| - A compound as claimed in claim 1, wherein R11, R12 and R13 are identical or different and are a hydrogen atom, a halogen atom, a C1-C4-alkyl group, a CF3 group, a C6-C8-aryl group, a pentafluorophenyl group, a C1-C4-alkoxy group a C2-C4-alkenyl group, a C7-C10-arylalkyl group, a C8-C12-arylalkenyl group and a C7-C12-alkylaryl group, or R11 or R12 or R11 and R13, in each case together with the atom
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