Table 1.

NMR spectroscopic data (CD₃OD) for osmanicin (1).

Osmanicin (1) a
No.	δC, type	δH, mult. (J in Hz)	HMBC
2	43.4, CH2	3.62, bt (7.4)	C-3, 4, 19
3	36.2, CH2	2.39, (dt (8.4, 3.9)	C-2, 4, 5
4	185.7, C
5	112.4, C
6	61.0, C
7	38.9, CH	2.81, b quint (7.6)	C-6, 21, 22
8	33.2, CH	2.60, m	C-6, 23
9	141.3, C
10	80.0, CH	4.68, m	C-9, 11
11	83.5, CH	4.69, m	C-10, 12, 13, 18
12	64.5, CH	4.53, b d (1.4)	C-18
13	138.7, C
14	38.8, CH	3.36, m	C-13, 16
15	28.6, CH2	1.02, m 1.41, d quint (13.3, 2.9)
16	43.6, CH2	3.11, td (13.3, 3.2)	C-18
		3.58, dd (5.1, 2.3)
18	160.0, C
19	169.2, C
20	127.4, CH	6.33, d (5.8)	C-5, 6, 19, 21
21	154.6, CH	6.78, d (5.8)	C-5, 6, 20
22	12.8, CH3	1.05, d (7.4)	C-6, 7, 8
23	13.4, CH3	0.62, d (7.1)	C-7, 8, 9

^{a 1}H and ¹³C chemical shifts were recorded at 300 and 75 MHz respectively.