Table 2.

¹³C-NMR spectroscopic data (CDCl₃) for compounds 1–4.

Position	1	3	4	2 a
	δC Mult.	δC Mult.	δC Mult.	δC Mult.
1	182.80 s	184.75 s	197.20 s	196.91 s
2	158.31 s	144.36 s	135.84 s	137.29 s
3	107.09 s	144.21 s	160.58 s	158.20 s
4	186.95 s	183.90 s	67.88 d	69.10 d
5	138.75 s	138.85 s	43.40 d	43.00 d
6	144.09 s	141.67 s	40.24 d	41.29 d
7	25.68 t	25.29 t	26.94 t	26.84 t
8	118.98 d	118.87 d	121.19 d	120.36 d
9	137.51 s	137.57 s	137.76 s	137.77 s
10	39.68 t	39.68 t	39.62 t	39.60 t
11	26.43 t	26.45 t	26.35 t	26.44 t
12	123.82 d	123.83 d	124.83 d	124.90 d
13	135.19 s	135.18 s	134.04 s	133.80 s
14	39.66 t	39.67 t	42.20 t	42.29 t
15	26.74 d	26.72 d	125.22 d	125.26 d
16	124.30 d	124.29 d	139.16 d	139.20 d
17	131.29 s	131.27 s	70.76 s	70.63 s
18	25.48 q	25.67 q	29.85 q	29.77 q
19	17.65 q	17.64 q	29.80 q	29.77 q
20	16.00 q	15.98 q	16.14 q	16.02 q
21	16.34 q	16.30 q	16.14 q	16.08 q
22	11.85 q	11.92 s	12.32 q	12.83 q
23	56.07 q	61.12 q	60.59 q	60.69 q
24		61.12 q	59.20 q	59.67 q

^a Acetate group: δ 169.77 (s, C=O), 20.94 (q, CH₃).