The starting point for this refit is Parsley 1.3.0, which includes valence parameters fit against improved training data (compared to Parsley 1.0.0) and several new bond, angle and torsion types that address specific chemistries. The reversion of the sulfonamide angle in Parsley 1.3.1 was not included in this refit, as development on Sage 2.0.0 was already underway by the time Parsley 1.3.1 was released. However, testing the parameters from Sage on the reported discrepancy, in 'O∼S∼N' angles of sulfonamides, showed that this problem was resolved by the Sage workflow and did not require further fixes.