This function returns a data.frame with the default rules for metabolic logic, which can be used by
generateTPsLogic and genFormulaTPLibrary.
References
Schollee JE, Schymanski EL, Avak SE, Loos M, Hollender J (2015). “Prioritizing Unknown Transformation Products from Biologically-Treated Wastewater Using High-Resolution Mass Spectrometry, Multivariate Statistics, and Metabolic Logic.” Analytical Chemistry, 87(24), 12121–12129. doi:10.1021/acs.analchem.5b02905 .