Table 1. ¹³C (100 and 125 MHz) NMR Spectroscopic Data for Compounds 1–6 in CDCl₃.

no	1	2a	3	4	5	6
1	40.2	45.3	47.1	55.4	39.4	33.6
2	134.3	173.0b	213.5	213.2	152.8	52.7
3	133.2	101.8b	47.0	49.4	147.8	74.1
4	28.9	22.2	30.6	32.2	18.1	33.0
5	22.8	33.6	37.5	26.4	26.3	32.9
6	82.3	67.5	75.5	84.6	83.5	215.9
7	37.7	31.7	84.0	69.4	69.9	50.5
8	31.7	32.2	27.7	32.8	34.3	29.9
9	27.3	26.1	29.8	20.9	20.6	23.7
10	83.2	92.3	85.6	73.4	72.7	82.6
11	39.3	40.0	39.6	39.9	36.1	39.5
12	168.8	170.6b	19.3	20.7	195.7	68.3
13	20.4	14.2	20.9	24.7	23.7	30.6
14	25.9	29.2	27.7	27.3	23.7	33.2
15	22.0	21.9	27.6	21.1	22.2	29.2

^a13C NMR (125 MHz).

^b13C NMR (200 MHz).