We report specific heat measurements on a high quality single crystal of the heavy-fermion compound CePt_2In_7 in magnetic fields up to 27 T. The zero-field specific heat data above the Néel temperature, T_N, suggest a moderately enhanced value of the electronic specific heat coefficient γ = 180 mJ/K^2mol. For T<T_N, the data at zero applied magnetic field are consistent with the existence of an anisotropic spin-density wave opening a gap on almost entire Fermi surface, suggesting extreme

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... mensional electronic and magnetic structures for CePt_2In_7. T_N is monotonically suppressed by magnetic field applied along the c-axis. When field is applied parallel to the a-axis, T_N first increases at low field up to about 10 T and then decreases monotonically at higher field. Magnetic phase diagram based on specific heat measurements suggests that a field-induced quantum critical point is likely to occur slightly below 60 T for both principal orientations of the magnetic field.