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We study the spin chain behavior, a transition to 3D magnetic order and themagnitudes of the exchange interactions for the metal-amino acid complexCu(D,L-alanine)2.H2O, a model compound to investigate exchange couplingssupported by chemical paths characteristic of biomolecules. Thermal andmagnetic data were obtained as a function of temperature (T) and magnetic field(B0). The magnetic contribution to the specific heat, measured between 0.48 and30 K, displays above 1.8 K a 1D spin-chain behavior that can be fitted with anintrachain antiferromagnetic (AFM) exchange coupling constant 2J0 = (-2.12$\pm$ 0.08) cm$^{-1}$, between neighbor coppers at 4.49 {\AA} along chainsconnected by non-covalent and H-bonds. We also observe a narrow specific heatpeak at 0.89 K indicating a phase transition to a 3D magnetically orderedphase. Magnetization curves at fixed T = 2, 4 and 7 K with B0 between 0 and 9T, and at T between 2 and 300 K with several fixed values of B0 were globallyfitted by an intrachain AFM exchange coupling constant 2J0 = (-2.27 $\pm$ 0.02)cm$^{-1}$ and g = 2.091 $\pm$ 0.005. Interchain interactions J1 between coppersin neighbor chains connected through long chemical paths with total length of9.51 {\AA} are estimated within the range 0.1 < |2J1| < 0.4 cm$^{-1}$, coveringthe predictions of various approximations. We analyze the magnitudes of 2J0 and2J1 in terms of the structure of the corresponding chemical paths. The maincontribution in supporting the intrachain interaction is assigned to H-bondswhile the interchain interactions are supported by paths containing H-bonds andcarboxylate bridges, with the role of the H-bonds being predominant. We comparethe obtained intrachain coupling with studies of compounds showing similarbehavior and discuss the validity of the approximations allowing to calculatethe interchain interactions.

Antiferromagnetic spin chain behavior and a transition to 3D magnetic order in Cu(D,L-alanine)2: Roles of H-bonds