T. Kolev et al., Crystal structure of 4-[(4-N,N-dimethylaminophenylene)amino]-3-ethoxy-3-cyclobutene-1,2-dione, C14H16N2O3, Z KRIST-NEW, 216(2), 2001, pp. 241-242
C14H16N2O3, triclinic, P(1) over bar (No. 2), a = 6.3066(1)Angstrom, b = 7.
5559(2)Angstrom, c = 14.7551(4)Angstrom, alpha = 88.5449(9)degrees, beta =
82.533(1)degrees, gamma = 69.205(1)degrees, V = 651.6 Angstrom (3), Z = 2,
R-gt(F) = 0.046, wR(ref)(F-2) = 0.134, T = 291 K.