1,3,6,8-Tetranitro-4,9-dihydropyrido[2,3,4,5-lmn]phenanthridine-5,10-dione;pyrido[2,3,4,5-lmn]phenanthridine-5,10-dione, 4,9-dihydro-1,3,6,8-tetranitro-
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