(1S,2R,4S,5R)-8-Vinyl-tricyclo[3.2.2.02,4]non-8-ene-6,6,7,7-tetracarbonitrile

rac-(5R,5aS,6aR,7S)-2-phenyl-9-vinyl-5a,6,6a,7-tetrahydro-1H,5H-5,7-ethenocyclopropa[d][1,2,4]triazolo[1,2-a]pyridazine-1,3(2H)-dione