The SIB has collected a long list of queries on this page [2].
References
Morgat A, Lombardot T, Coudert E, Axelsen K, Neto TB, Gehant S, et al. Enzyme annotation in UniProtKB using Rhea. Bioinformatics. 2020 Mar 1;36(6):1896–901. doi:10.1093/BIOINFORMATICS/BTZ817 (Scholia)