  We report a corrected crystal structure for the CePt2In7 superconductor,
refined from single crystal x-ray diffraction data. The corrected crystal
structure shows a different Pt-In stacking along the c-direction in this
layered material than was previously reported. In addition, all the atomic
sites are fully occupied with no evidence of atom site mixing, resolving a
discrepancy between the observed high resistivity ratio of the material and the
atomic disorder present in the previous structural model The Ce-Pt distance and
coordination is typical of that seen in all other reported Ce_nM_mIn_3n+2m
compounds. Our band structure calculations based on the correct structure
reveal three bands at the Fermi level that are more three dimensional than
those previously proposed, and Density functional theory (DFT) calculations
show that the new structure has a significantly lower energy.
