prov:value
| - R1 is an alkyl group having 1 to 20 carbon atoms, specifically a methyl group, an ethyl group, a n-propyl group, an iso-propyl group, a n-butyl group, an iso-butyl group, a tert-butyl group, a n-pentyl group, a n-hexyl group, a n-octyl group and the like.
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