Self-assembly of Guanidinium Hexagonal Carboxylate: How Many H-bonds and H-bonding Pattern between ArCOO- and C(NH2)3+?

In guanidinium hexacarboxylate, H·G6·2H2O (2, G = C(NH2)3, the guanidinium cations and the side pyridinecarboxylate rings are self-assembled via multiple H-bonds into zigzag-like ribbons which located between the hexahost H core plane layers. The H-bonds graph set present in the zigzag ribbons are R2^2(8), R2^1(6), R2^2(10), R1^2(6), R2^4(12), R5^3(10), R8^6(24), and R8^4(24).