Any ideas what this sharp ATR-FTIR spectra peak at 1405cm-1 is?

The IR spectra attached is of a fouled cat shark (S. canicula) egg case, with a very intense peak at 1405cm-1. I've considered O-H stretching or S=O bending, has anyone seen a similar peak or does...

05 March 2020 3,441 4 View