Table 16.

NMR ¹³C spectra of 17a–17f (CDCl₃, δ).

№	17a	17b	17c	17d	17e	17f
C-17	142.43	143.82	143.09	142.48	142.30	142.35
C-18	125.64	125.43	125.30	125.01	124.84	125.12
C-19	127.14	127.14	127.13	127.07	127.11	127.14
C-20	126.07	125.93	126.00	126.04	126.20	126.28
C-21	158.06	158.19	158.08	158.03	158.10	158.05
C-22	110.26	110.21	110.14	110.25	110.41	110.34
C-23	127.69	128.96	127.93	127.96	128.06	128.65
C-24	65.26	65.91	65.88	65.32	65.16	65.22
C-25	55.47	55.46	55.36	55.46	55.53	55.78
C-26	d 154.74 (J = 2.2 Hz)	d 146.61 (J = 10 Hz)	d 146.61 (J = 11 Hz)	d 154.81 (J = 2.4 Hz)	t 160.57 (J = 13.4 Hz)	d 150.14 (J = 2.4 Hz)
C-27	d 115.56 (J = 12 Hz)	115.50	d 151.42 (J = 247 Hz)	116.44	d 162.68 (J = 244 Hz)	d 121.50 (J = 10 Hz)
C-28	d 115.83 (J = 3.2 Hz)	d 151.84 (J = 249 Hz)	d 116 (J = 16 Hz)	120.83 (J = 19 Hz)	t 96.47 (J = 29 Hz)	d 118.51 (J = 28 Hz)
C-29	d 155.68 (J = 239 Hz)	d 116.00 (J = 19 Hz)	d 121.24 (J = 7 Hz)	d 151.54 (J = 247 Hz)	d 162.55 (J = 244 Hz)	d 156.08 (J = 247 Hz)
C-30	d 115.83 (J = 3.2 Hz)	d 124.08 (J = 3.5 Hz)	d 124.10 (J = 3.4 Hz)	d 116.51 (J = 22 Hz)	m 98.50	d 114.06 (J = 21 Hz)
C-31	d 115.56 (J = 12 Hz)	d 121.25 (J = 8 Hz)	115.41	d 114.30 (J = 6.7 Hz)	m 98.50	d 114.67 (J = 9.4 Hz)