you can get it using Chem Draw. You can get both NMR and IR predictions for your compound provided your derivatives are not too complex in structure. Or you can try science finder.

ChemDraw is really good for 13C-NMR but can be problematic for 1H-NMR. Have you looked at using Gaussian through an free-ware GUI such as WebMO or Avogadro? I suspect that you can get in the ballpark (spectrally speaking) using computational methods.