| http://www.w3.org/ns/prov#value | - entical or different, may be chosen from linear and branched alkyl groups of 1 to 6 carbon atoms, such as 2 or 3 carbon atoms, and hydroxyalkyl groups of 1 to 4 carbon atoms; [0118] R4, R5 and R6, which may be identical or different, may be chosen from alkyl groups
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