prov:value
| - have suitable substituents, phenyl which may have suitable substituents, or thienyl which may have suitable substituents, A is a group of the formula: ???(CH2)t???(O)m???or in which R3 and R4 are each hydrogen or linked together to form imino, R5 is hydrogen or lower alkyl, t is 0, 1 or 2, p, m and n are each 0 or 1, X is phenylene which may have suitable substituents, or bivalent heterocyclic gro
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