prov:value
| - s, an alkoxy group having from 1 to 4 carbon atoms, a halogen atom, a hydroxy group, a nitro group, a phenyl group, a trifluoromethyl group or an amino group of formula --NRa Rb, wherein Ra and Rb are as defined above, provided that, if Ra or Rb represents an aryl group or represents a group including an aryl group, that aryl group is not itself further substituted by a group of formula --NRa Rb ;
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