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In 2022, Hatori gave a sufficient condition for complex Banach spaces to have the complex Mazur–Ulam property. In this paper, we introduce a class of complex Banach spaces that do not satisfy the condition but enjoy the property that every surjective isometry on the unit sphere of such admits an extension to a surjective real linear isometry on the whole space . Typical examples of Banach spaces studied in this note are the spaces of all Lipschitz complex-valued functions on and of all continuously differentiable complex-valued functions on equipped with the norm .

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