prov:value
| - tively: wherein R represents an acetoxy group, R represents hydrogen, or a hydrocarbon group e.g. alkyl or aryl, an ether group or an acetoxy group, each of R R R and R represents hydrogen, or a hydrocarbon group e.g. alkyl such as methyl, ethyl, n-propyl, isopropyl, n-butyl, tert. butyl, or isoamyl, an aryl group or substituted aryl group, acetyl or allyl, whereby R and R together may represent t
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