| 摘要 |
The invention relates to a 1,2,3,-benzothiadiazole derivative represented by the formula: (see formula) wherein Het represents (see formula) R1 represents hydrogen, optionally substituted C1-6 alkyl, optionally substituted C2-6 alkenyl or phenyl, and R2 and R3 represent, each independently, hydrogen or optionally substituted C1-6 alkyl,
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