Closer inspection revealed that this misclassified ether had similar spectral features than the one found in Oxolan-3-one. Another interesting result is that all models trained in the oversampled database with the SVMSMOTE algorithm misclassified both the ketone and the benzylic groups in the 3-Ethylacetophenone structure, predicting benzylic and ketone respectively. Although these are wrong predictions, they correctly predicted the list of structural groups for this structure (one alkane, one ketone, one benzylic, and two aromatics) and should not take long for a person with a minimum expertise in 1 H NMR analysis to figure out the mistake made by the models given the spectral features of both structural groups.