prov:value
| - In the definitions of R1 ', the lower alkyl group and the lower alkyl group in the carbamoyl group which is mono- or di-substituted by a lower group is preferably a straight-chain, branched or cyclic alkyl group of 1 to 6 carbon atoms, e.g. methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, sec-pentyl isopentyl, neopentyl, n-hexyl, isohexyl, cyclopropyl, cyclob
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