E. Horn et al., Crystal structure of hexaaquocobalt(II) theophylline-7-acetate tetrahydrate, [Co(OH2)(6)][C9H9N4O4](2) center dot 4H(2)O, Z KRIST-NEW, 215(3), 2000, pp. 441-442
C18H38CoN8O18, triclinic, P (1) over bar (No. 2), a = 8.141(2) Angstrom, b
= 9.117(1) Angstrom, c = 11.893(1) Angstrom, alpha = 105.4(3)degrees, beta
= 95.25(1)degrees, gamma = 115.08(1)degrees, V = 749.5 Angstrom(3), Z = 1,
R-gt(F) = 0.036, wR(ref)(F) = 0.039, T = 293 K.