Compound 12

(E)-1-(2,4-Dinitrophenyl)-2-(((3S,3aS,6R,7S,8aS)-3,8,8-trimethyloctahydro-1H-3a,7-methanoazulen-6-yl)methylene)hydrazine

From: Synthesis of highly strained terpenes by non-stop tail-to-head polycyclization