| http://www.w3.org/ns/prov#value | - having from 3 to 39 carbon atoms, still more preferably having from 3 to 33 carbon atoms, and particularly preferably having 3 to 27 carbon atoms, such as trimethylsiloxy, triethylsiloxy, and tri t-butylsiloxy), an acyl group (preferably having from 1 to 20 carbon atoms, more preferably having from 1 to 16 carbon atoms, and particularly preferably having from 1 to 12 carbon atoms, such as acetyl,
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