Table 2.

¹³C-NMR of 3 and 4 (100 MHz, CDCl₃) ^a.

C	3	4 [6]	C	3	4 [6]
1	25.3	25.2	11	214.7	214.4
2	30.3	37.8	12	48.4	48.5
3	77.2	214.6	13	41.6	41.6
4	42.1	51.0	14	38.4	38.4
5	145.5	144.2	15	147.9	147.7
6	117.0	118.2	16	110.2	110.4
7	28.9	29.0	17	23.5	23.5
8	38.3	38.2	18	21.4	22.7
9	48.9	49.4	19	24.4	29.5
10	37.9	38.6	20	12.7	12.0

^a Chemical shift values are in δ (ppm).