MassHunter Quantitative method is not matching to library for specific compound


Any idea why 3 of my compounds below do not produce a match in any sample?

See spectrum - usually you'd see the head-to-tail

See N-acetyl-L-Leucine 2TMS, there's no match score

The reference library contains NIST spectra for all these compounds. 

This is a standards pool, so I know it is there. It will match by deconvolution/lib search.

The QL ratios are within range.

I tried modifying Integration Parameters Peak filters, Lib Match Score outlier, Correlation Window, fwd-rev score, and many other things. I picked this example because it does not have any co-elution.


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