| http://www.w3.org/ns/prov#value | - The first part of the derivatisation agent, i.e. electrophilic part, can be illustrated by C???C; C???Y, wherein Y represents for example a halogen, such as Br, I, Cl, or a mesylate, or a tosylate group; or an acid or an activated acid such as WC???O, wherein W is for example formed from N-hydrosuccinimide, pentafluorophenol, para-nitrophenol or isopropyl chloroformate.
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