| http://www.w3.org/ns/prov#value | - in which: R.sub.13 represents a hydrogen atom, a halogen atom, such as fluorine, or a C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 monohydroxyalkyl, (C.sub.1 -C.sub.4)alkoxy(C.sub.1 -C.sub.4)alkyl, C.sub.1 -C.sub.4 aminoalkyl or hydroxy(C.sub.1
|
