prov:value
| - The substituent R26 represents a hydrogen atom, or a substituted or unsubstituted alkyl group (e.g., methyl, ethyl, n-propyl, isopropyl, n-butyl, pentyl, hexyl, heptyl, octyl, nonyl, 2-chloroethyl, methoxyethoxyethyl, preferably a lower alkyl such as methyl or ethyl, more preferably methyl), and is preferably a hydrogen atom.
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