| http://www.w3.org/ns/prov#value | - methyl or ethyl, CO, C8H14 or 0.5 C8H12, R3 is an alkyl radical, cycloalkyl radical or aryl radical and R2 is an alkyl radical an aryl radical or an oxygen substituted radical, a is 0 or 1, b is 1 or 2, c is a whole number from 1 to 4 inclusive and d is 2, 3 or 4, n is 0 or 1.
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