| prov:value
| - The organic compounds represented by A and Z optionally contain one or more substituents selected from the halogens F, Cl, Br, I, the --OH or --OR1 groups, the alkyl, the alkene and alkyne groups, these various groups preferably having 1 to 8 carbon atoms, more particularly 1 to 4 carbon atoms, the --COOH, --COOR1, --COR1, --CH2 OH, --CH(R1)--OH, --C(R1, R2)OH, or their ethers, --CHO, ##STR1## --C
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