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Cycloaddition of maleic anhydride to N,N′-bis(1-hexylheptyl)-2-phenyl-benzo[4.10]anthra[1,9,8-cdef][1,2,4]triazolyl[1,2-a]cinnoline-1,3-dione-5,6:11,12-bis(dicarboximide) [188]. Reagents and conditions: (a) p-chloranil, CHCl3 (small amount), 125 °C, 4 weeks; Y = 57%.
