| http://www.w3.org/ns/prov#value | - ##STR00004## with a compound of formula R.sup.3-L.sup.2, wherein R.sup.1a, R.sup.2, R.sup.3 and n are as defined above, L.sup.2 represents a suitable leaving group such as a halogen atom and Z represents a boronic acid ester group attached at
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