| http://www.w3.org/ns/prov#value | - R.sub.2 is a hydrogen or fluorine atom; R.sub.b is an R.sub.3 O--CO--CH.sub.2 --N--CH.sub.2 --CH.sub.2 --OH group optionally substituted at the methylene groups by 1 or 2 methyl or ethyl groups, wherein R.sub.3 is a hydrogen atom or a C.sub.1-4 -alkyl
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