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Is this based on default USP 797 guidelines or proprietary stability data

However, to confirm the structure of the unknown compounds, especially those for which reference materials are not available, nuclear magnetic resonance (NMR) spectrometry is recommended (Rebiere et al., 2017

The more in tune you are with these shifts, the more confident you will feel in your choices.

The needle may bend, but it is much more likely that the injection may end up outside the pet rather than inside when dealing with a wiggly pet