4H,9H-Dipyrazolo(1,5-a:1',5'-d)pyrazine-4,9-dione, 2,7-dimethyl-3,8-dinitro-;4H,9H-Dipyrazolo[1,5-a:1',5'-d]pyrazine-4,9-dione, 2,7-dimethyl-3,8-dinitro-
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