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Multistep stress‐relaxation experiments in torsion have been done on a single crystal of the long‐chain hydrocarbon compound n‐eicosane. It was found that at very small strains the behavior approaches that of a linear viscoelastic material, whereas at larger strains the behavior becomes increasingly nonlinear and time dependent. In the region where the stress‐strain behavior becomes nonlinear, it is shown that the second‐step response, in an experiment in which the magnitude of the second step is one half that of the first step, can be described very well using a recent constitutive equation proposed by Zapas.