prov:value
| - wherein R1 is a linear or branched C1-C20 alkyl or alkenyl group, preferably methyl, ethyl, propyl, butyl, pentyl or hexyl, examples of preferred primary alcohols being methanol (CH3OH), ethanol (CH3CH2OH), propanol (CH3CH2CH2OH), butanol (CH3CH2CH2CH2OH), 2-methyl propanol ((CH3)2CHCH2OH) and 2-methyl butanol (CH3CH2CH(CH3)CH2OH), secondary alcohols which have an ???OH group attached to a carbon
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