Figure 5.
Proposed primary structure for mb-SB2 based on the NMR analyses. The correlations observed in the 2D correlation experiments that led to this structure can be found in Figure S2 of the Supporting Information. The A-ring imidazolone is labeled as ImiA, while the B-ring oxazolone is labeled as OxaB. On the basis of mass, this is not the complete structure.