• A compound structure was considered to be correct when applying the rules for recognizing single structures as mentioned above. • The reaction always needs to have at least one correct starting material and one correct product. • The starting material(s) and the product(s) need to picture the main features / reacting atoms of the reaction. • Reaction conditions are not required for correctness and were omitted in the evaluation. • When small but wrong hallucinated single atoms were predicted as reactants or products, for example, C as a single carbon atom or Y like a Yttrium atom, the reaction was still assumed to be correct provided larger reactants and products were present and the other criteria were met. Our reasoning for this rule was that one could potentially remove those single atoms in a post-prediction step with a rule based approach. • If a reagent from reaction conditions (placed over the reaction arrow) was recognized as a reactant, the reaction was still considered as correct. • Stoichiometry was not considered to be a required criterion.