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Denote by $\\mathcal{Z}$ the center of the universal enveloping algebra $U(\\mathfrak{g})$. Then $\\mathcal{Z}$ turns out to be finitely-generated purely-even commutative algebra without nonzero divisors.\n  In this paper, we demonstrate that the fraction $\\text{Frac}(\\mathcal{Z})$ is isomorphic to $\\text{Frac}(\\mathfrak{Z})$ for the center $\\mathfrak{Z}$ of $U(\\mathfrak{g}_{\\bar 0})$. 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