| http://www.w3.org/ns/prov#value | - The preferred diols HO???(CHR11???)aOH include those in which R11 is hydrogen and a is from 2 to 6, and those in which a is 2 and R11 is selected from hydrogen and the alkyl radicals having from 1 to 10, in particular from 1 to 3, carbon atoms.
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