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Temperature-dependent NMR shift $K(T)$, which is a direct measure of the intrinsic spin susceptibility, agrees very well with the spin-1/2 alternating-chain model, justifying the assignment of the spin lattice. From the analysis of $K(T)$, magnetic exchange parameters were estimated as follows: the leading exchange $J/k_{\\rm B} \\simeq 38.4$ K, alternation ratio $\\alpha = J'/J \\simeq 0.68$, and spin gap $\\Delta/k_{\\rm B} \\simeq 15$ K. 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