2,2,7,7-Tetramethyl-1,2,3,6,7,8-hexahydrocinnolino[5,4,3-cde]cinnoline;2,2,7,7-Tetramethyl-1,2,3,6,7,8-hexahydro-cinnolino[5,4,3-cde]cinnoline;cinnolino[5,4,3-cde]cinnoline, 1,2,3,6,7,8-hexahydro-2,2,7,7-tetramethyl-
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