Table 1.

¹H NMR Data (δ) of 1–4 (600 MHz, δ in ppm, J in Hz).

No.	1a	2a	3b	4b
2	6.82, d (8.4)	6.86, d (8.4)	6.77, d (8.4)	6.78, d (8.4)
3	7.66, d (8.4)	7.72, d (8.4)	7.82, d (8.4)	7.83, d (8.4)
5	7.24, s	7.21, s	7.50, s	7.40, s
14	5.10, brs	5.13, d (2.4)	5.47, d (2.8)	5.48, brs
15	3.45, brs	3.46, brs	3.27, brd (7.2)	3.27, brd (6.6)
17	1.25, s	1.25, s	1.21, s	1.22, s
18	1.40, s	1.42, s	1.28, s	1.29, s
19	4.54, brd (10.8)	4.43, brd (10.8)	4.56, brd (11.4)	4.46, brd (11.4)
	4.31, dd (10.8, 2.4)	4.35, dd (10.8, 2.4)	4.20, dd (11.4, 2.4)	4.34, dd (11.4, 2.4)
20	2.71, brs	2.72, brs	2.68, brs	2.51, brs
22	4.80, s	4.78, s	4.79, s	4.74, s
	4.75, s	4.56, s	4.61, s	4.55, s
23	1.88, s	1.84, s	1.81, s	1.78, s
24	2.35, s	2.35, s	2.31, s	2.29, s
25	6.89, brs	5.40, brs	6.81, brs	5.81, brs
1-OH	12.97, brs	12.71, brs	12.78, brs	12.84, brs
14-OH/OCH3	3.28, s	3.29, s	5.19, d (5.4)	5.17, d (3.6)
15-OH	2.73, brs	2.95, brs	4.44, brd (7.2)	4.46, brd (6.6)
16-OH	—	—	4.55, brs	4.54, brs
25-OH/OAc	2.07, s	4.94, d (2.4)	1.99, s	5.26, d (3.6)

^aRecorded in CDCl₃. ^bRecorded in DMSO-d₆.