... Volume 985, Issue 1, 15 January 2011, Pages 75–81. ... 3,7-Dinitro-1(2)H-indazole (3) was first reported by Habraken and Cohen-Fernandes in 1971 in a two-step ... Compound 3 has been prepared two more times by Wrzeciono, but always with the same procedure [17] and [18]. ...