Analyzing the cycle lengths of the reaction center could provide insights into the reaction steps involved. To this end, we took the number of entries in the list of cycle length as estimate for the number of steps. We verified on a subset of 100 reactions that this estimator is plausible from a chemical point of view. See Supplementary File 2. In the database, 87.0% of reactions were single-step, similar to the proportion of elementary reactions. Only 10.98%