prov:value
| - The compound of the formula (IV), wherein X1 is a hydrogen atom, a halogen atom, a lower alkyl group or a lower alkoxy group (=Z1), X2 is a hydrogen atom, a halogen atom, a lower alkyl group or a lower alkoxy group (=Z2), Y1 is --SO2 Cl and Y2 is --SO2 Cl, that is, a compound of the formula: ##STR49## wherein Z1, Z2, m and n are as defined above, can be produced by reacting a compound of the formu
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