| http://www.w3.org/ns/prov#value | - When B is a group B5, W6 is advantageously a hydrogen, W7 is a hydroxyl and W8 is a phenyl which is unsubstituted or substituted by a methoxy, a hydroxyl, a methylthio or a methylsulfinyl; or W6 and W7 are hydrogen and W8 is a pyridyl, pyrimidyl or thienyl group substituted by a halogen, especially chlorine or fluorine, or by one of the following groups: cyano, trifluoromethyl, hydroxyl, (C1-C5)al
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