| http://www.w3.org/ns/prov#value | - mpound of the formula ##STR22## with a compound of the formula R.sub.2 '-E wherein E is a functional group residue and R.sub.2 ' has the above definition to obtain the corresponding compound of formula I'.sub.F orreacting a compound of the formula ##STR23## wherein B has the above definition with a compound of the formula R.sub.2 '-E wherein R.sub.2 ' and E have the above definition to obtain a co
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