Table 2. Proton and Carbon NMR Data for YT46 (1) and YT46b (2).

Spectra were obtained at 400 MHz for proton and 100 MHz for carbon and were recorded in acetone-d ₆

^aCarbons are labeled as shown in Figure 4B

^b1, 2-¹³C-acetate labeling experiments were performed with 2 and the observed carbon–carbon coupling constants are shown in parenthesis