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. Author manuscript; available in PMC: 2023 Dec 20.

Published in final edited form as: J Nat Prod. 2023 Jun 27;86(7):1855–1861. doi: 10.1021/acs.jnatprod.3c00393

Table 2. ¹H (600 MHz) and ¹³C (150 MHz) NMR Spectroscopic Data for Caulamidine C (2) and Isocaulamidine C (3) in CD₃OD.

no.	caulamidine C (2)		isocaulamidine C (3)
no.	$δ_{C}$ , type	$δ_{H}$ (mult., J in Hz)	no.	$δ_{N}$ , type	$δ_{H}$ (mult., J in Hz)
2	168.9, C		2	168.9, C
4	149.8, C		4	145.4, C
5	125.7, CH	7.29 (d, 7.5)	5	126.5, CH	7.34^a
6	132.5, CH	7.55 (t, 7.5)	6	132.3, CH	7.57 (td, 7.5, 1.5)
7	116.1, CH	7.34^a	7	114.5, CH	7.31^a
8	125.5, CH	7.27 (d, 7.5)	8	126.5, CH	7.30^a
9	127.1, C		9	126.5, C
10	60.3, C		10	61.4, C
11	47.9, CH	5.48 (dd, 10.3, 6.6)	11	49.8, CH	5.26 (dd, 9.9, 6.3)
12a	54.6, CH₂	4.38 (dd, 14.0, 6.6)	12a	51.53, CH₂	4.41 (dd, 17.4, 6.3)
12b		4.07 (dd, 14.0, 10.3)	12b		3.94 (dd, 17.4, 9.9)
14	158.1, C		14	153.8, C
16	140.3, C		16	143.5, C
17	123.7, CH	7.53 (d, 1.7)	17	118.8, CH	7.31^a
18	123.1, C		18	123.3, C
19	129.4, CH	7.31^a	19	125.7, CH	7.14 (dd, 8.0, 1.8)
20	131.9, CH	7.08 (d, 8.1)	20	131.8, CH	7.00 (8.0)
21	121.1, C		21	120.6, C
22a	34.1, CH₂	2.73 (d, 16.3)	22a	34.8, CH₂	2.62 (d, 15.5)
22b		2.59 (d, 16.3)	22b		2.40 (d, 15.5)
23	48.3, C		23	48.2, C
24	51.1, CH	4.49 (dd, 8.4, 7.3)	24	51.46, CH	4.21 (t, 8.5)
25a	55.5, CH₂	4.40 (dd, 15.0, 7.3)	25a	55.7, CH₂	4.44 (dd, 15.1, 8.5)
25b		4.32 (dd, 15.0, 8.4)	25b		4.35 (dd, 15.1, 8.5)
26	39.8, CH₃	3.45 (s)	26	40.3, CH₃	3.53 (s)
27	39.2, CH₃	3.61 (s)	27	32.9, CH₃	3.55 (s)

^a

Signals overlapped.