prov:value
| - The hydrazide of the formula (IIb) can be further obtained by a known procedure, that is, reacting a compound of the formula (VI): ##STR10## wherein A, B, R1, R2, R3, R4, R5, R6, R7 and n have the same meanings as defined above, with an aldehyde of the formula (VII): ##STR11## wherein R15 is hydrogen atom or alkyl group and R16 is an alkyl group, the total carbon number of R15 and R16 being 2 to 9
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