| http://www.w3.org/ns/prov#value | - wherein R2, Ar, L and Y have the meanings stated above, provided that when there is an amino, alkylamino or hydroxy group in R2, Ar or Y, any amino or alkylamino group is protected by a conventional protecting group and any hydroxy group may be protected by a conventional protecting group or alternatively any hydroxy group need not be protected, whereafter any undesired protecting group in R1, R2,
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