| http://www.w3.org/ns/prov#value | - The following are examples of protective groups of this type: linear or branched C1 -C8 alkyl, especially C1 -C4 alkyl, for example methyl, ethyl, n-propyl, isopropyl or n-, iso- and t-butyl; C7 -C12 aralkyl, for example benzyl, trialkylsilyl having 3 to 20, particularly 3 to 10, C atoms, for example trimethylsilyl, triethylsilyl, tri-n-propylsilyl, isopropyldimethylsilyl, t-butyldimethylsilyl, n-
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