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son especialmente preferidos 6 átomos de carbono en el grupo arilo y 1-3 átomos de carbono en el grupo alquilo o grupo alcoxi, respectivamente, por ejemplo, fenilmetilo, feniletilo, fenilmetoxi, feniletoxi, fenilpropilo, fenilisopropoxi, fenilmetiltio y feniletiltio.
especially preferred are 6 carbon atoms in the aryl group and 1-3 carbon atoms in the alkyl group or alkoxy group, respectively, e.g. phenyl ethyl, phenylethyl, phenylmethoxy, phenylethoxy, phenylpropyl, phenyl sopropoxy, phenylmethylthio, and phenylethylthio.