As an external test set, in addition to the CAS-derived dataset, we adapted a table from 1995 by Barresi and Hindsgaul with 734 recorded glycosylations. The table includes information about the linkage formed, LG, C-2 substituent, and activators. We manually added solvents and reaction temperatures to the table by tracing reactions to their original articles. However, since the exact structures of the donor and acceptors are not given in the table, we had to make a simplified model to omit these features when testing on this dataset.