prov:value
| - The compound of the formula (VI), 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, the compound of the formula: ##STR72## wherein Z1, Z2, m and n are as defined above, can be produced by reacting a compound of the fo
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