prov:value
| - wherein A is a group represented by ##STR100## (in which each of R7 and R8, which may be the same or different, is a lower alkyl or phenyl group), to obtain a compound represented by the formula (VII), ##STR101## wherein R4, R5, A, Y and m are as defined above, and then reacting the resulting compound (VII) with, for example, hydroxylamine or hydrazine, or reacting the resulting compound (VII) wit
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