1743-13-1 NSC55937 Octahydro-s-tetrazino[1,2-a]-s-tetrazine Octahydro[1,2,4,5]tetrazino[1,2-a][1,2,4,5]tetrazine Tetraformaltrisazine [1,2,4,5]Tetrazino[1,2-a][1,2,4,5]tetrazine, octahydro- s-Tetrazino[1,2-a]-s-tetrazine, octahydro-