Computer‐aided interpretation of mass spectra. STIRS prediction of rings‐plus‐double‐bonds values

Abstract
The number of rings‐plus‐double‐bonds (R + DB) in an unknown molecule can be predicted from its mass spectrum using the ‘Self‐Training Interpretive and Retrieval System’.2 The average R + DB value of the 15 compounds selected by the overall match‐factor (highest MF11.0 values) predicts the R + DB value of the unknown within ±1 of the correct value for predictions between 0 and 4 in 87% of the cases, and within ±2 for predictions between 5 and 11 for 77% of the cases.