Table 1.

¹³C NMR spectral data of compounds 1–4 in CDCl₃.

C	Compound 1	Compound 2	Compound 3	Compound 4	C	Compound 1	Compound 2	Compound 3	Compound 4
1	40.54	40.52	16.01	15.46	16	21.78	23.86	35.86	35.69
2	18.90	18.70	25.19	30.23	17	54.40	55.00	42.79	42.61
3	42.32a	42.12	86.20	76.03	18	45.21	45.05	51.96	51.60
4	33.47	33.27	76.89	76.39	19	40.27	39.71	20.13	19.75
5	56.32	56.13	42.17	41.53	20	25.73	24.30	28.65	28.34
6	18.90	18.70	34.61	34.17	21	53.99	47.46	60.30	59.95
7	33.62	33.40	17.84	17.74	22	213.00	73.01	30.99	30.61
8	42.13	41.92	49.22	48.78	23	33.47	33.27	21.64	20.33
9	50.60	50.43	37.77	37.37	24	21.80	21.59	17.73	17.28
10	37.61	37.41	52.58	51.92	25	16.07	15.85	20.78	18.01
11	21.06	20.92	36.17	35.52	26	16.90	16.75	16.13	15.95
12	24.30	22.78	28.70	28.93	27	16.92	16.75	15.85	15.58
13	48.38	48.46	39.20	38.84	28	15.16	15.21	16.31	16.21
14	42.18a	42.00	40.42	40.05	29	30.42	21.73	22.17	21.78
15	32.61	32.71	29.28	29.56	30			23.13	22.72
					OMe			57.92

^aData may be interchangeable.