Liu Q, Zhang S W, Shao M C
Department of Chemistry, Peking University, Beijing, People's Republic of China.
Acta Crystallogr C. 1998 Mar 15;54 ( Pt 3):439-40. doi: 10.1107/s0108270197014844.
In the crystals of C14H22N4O4, the molecule has a crystallographic inversion center and the methylene chain is fully extended.