Opening data files: – For Bruker data (all other spectrometer) navigate to into the experiment folder to find the fid file. Drag a box around each group of equivalent protons. To do this, go to Analysis → Multiplet Analysis → Manual (or just hit the “J” key). The easiest one is to use the Multiplet Analysis tool. To calculate coupling constants in MestreNova, there are several options. How do you find the J value in MestreNova?