prov:value
| - zinylcarbonyl, and 1-piperazinylcarbonyl which may optionally have lower alkyl (for example, C1-6 alkyl such as methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, pentyl and hexyl, and the like), aralkyl (for example, C7-10 aralkyl such as benzyl and phenethyl, and the like), aryl (for example, C6-10 aryl such as phenyl, 1-naphthyl and 2-naphthyl, and the like), at its 4-position.
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