prov:value
| - Zo is OH or SH, Q1 preferably being H, alkyl or alkoxy having 1 to 5 C atoms, F, Cl or CN, in particular H, alkyl having 1 to 4 C atoms, F or CN, and Q1 to Q5 preferably being OR, SR, SO--R, SO2 --R or COOR, in particular OR, SR and SO2 --R.
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