prov:value
| - ether with the atoms connecting them, form an aromatic or aliphatic ring, R13 is ##STR19## ???BR14, ???AlR14, --Ge--, --O--, --S--, ???SO, ???SO2, ???NR14, ???CO, ???PR14 or ???P(O)R14, where R14 and R15 are identical or different and are a hydrogen atom, a halogen atom, a C1 -C10 -alkyl group, a C1 -C10 -fluoroalkyl group, a C1 -C10 -alkoxy group, a C6 -C10 -aryl group, a C6 -C10 -fluoroaryl grou
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