. As seen in Figure , the C5-O7 and C1-C9 distances are compressed in both the BsCM RS and TS in comparison to the uncatalyzed reaction. Furthermore, the C1 and C9 atoms are better aligned in the BsCM RS due to differences in the C1-C6-C5-O7, C6-C5-O7-C8, and C5-O7-C8-C9 torsions in comparison to the uncatalyzed RS.