Hi, I'm doing a spectroscopy assignment and am analysing the NMR for p-Toluic acid. However, I need to understand the NMRs of it's isomer o-Toluic acid as well. http://en.wikipedia.org/wiki/O-toluic_acid On first inspection, I thought there was 4 Hydrogen environments present in this molecule, yet I have found some databases stating otherwise? http://riodb01.ibase.aist.go.jp/sdbs/cgi-bin/direct_frame_top.cgi If you search "o-Toluic acid" and go to the top result both NMRs disagree with what I'd think to be correct. The CDCl3 Hydrogen NMR states that there is 5 hydrogen environments, whilst the DMSO-d6 Hydrogen NMR states there is 4 hydrogen environments, yet it labels two non-adjacent Hydrogens with different environments as the same. As a result can anyone help me figure out how many hydrogen environments are present in o-Toluic acid and which are which? Help greatly appreciated! Thank you!