| http://www.w3.org/ns/prov#value | - Y' and Z' as leaving groups are, independently, often selected from Ci-Ci 2 alkoxy, d- Ci 2 acyloxy, NH 2 , Ci-Ci 2 alkylamino, halogen such as iodo, or Y' and Z' are linked together to form, together with R18, a 5- or 6-membered heterocyclic ring.
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