Benzocaine has the following IR spectrum:
From what I understand: The two leftmost peaks are the antisymmetrical and symmetrical stretchs of the amine group. Just before the fingerprint region at about 1690 is the carbonyl ester peak and to the right of it (also before the fingerprint region) is the benzene C-C bonding peaks. The messy broad peaks just before 3000 are the C-H bonds of the non aryl C. The tiny peak at ~3040 is probably the aryl C-H bonds.
However I can't assign the peak at ~3200. It could be water of crystillisation in the sample (anywhere from 3100-3600cm^1) but surely there wouldn't be any in a proffesional sample? I also considered whether it could be due to -NH3^+ but the sample is made in a procedure that ensures the solution is alkaline before final purification...
Please could someone point me to a resource that will allow me to assign this peak or explain what it is to me?