Table 1.

NMR spectral data for okadaic acid,¹¹ and metabolites (1) and (2) in methanol-d₄

Unit	Okadaic acid		Metabolite 1		Metabolite 2
	δH	δC	δH	δC	δH	δC
1	—	182.8	—	181.07	—	181.88
2	—	76.3	—	76.04	—	76.66
3a/b	1.65/1.91	46.7	1.63/2.06	46.19	1.63/1.97	46.22
4	4.08	68.9	4.09	69.20	4.11	69.03
5	1.3/1.89	33.4	1.29/1.80	33.92	1.32/1.80	33.15
6	1.66/1.94	28.3	1.65/1.97	27.81	1.67/1.97	27.91
7	3.35	73.4	3.37	73.23	3.41	73.09
8	—	107.1	—	96.62	—	96.83
9	5.26	123.8	5.28	123.49	5.52	122.90
10	—	139.3	—	138.81	—	137.41
11	1.82/1.98	34	1.85/1.97	33.98	1.97	29.41
12	3.87	71.8	3.80	71.81	3.81	71.79
13	2.35	43.2	2.37	43.29	2.36	43.16
14	5.95	137.2	5.91	137.68	5.93	137.52
15	5.5	132	5.50	132.12	5.51	132.00
16	4.66	80.6	4.65	79.58	4.66	80.46
17	1.6/.2.21	31.5	1.59/2.19	31.42	2.19/1.60	31.36
18	1.85/2	38.1	1.86/2.21	37.10	2.20	37.35
19	—	97.5	—	106.14	—	106.87
20	1.84/1.87	34.2	1.85/2.00	38.01	1.85/2.01	37.98
21	1.8/1.9	27.7	1.78/1.89	27.36	1.78/1.90	27.47
22	3.63	71.4	3.64	71.38	3.64	71.22
23	3.42	78.3	3.41	78.11	3.41	77.94
24	4.07	72.1	4.07	72.01	4.07	71.96
25	—	147.1	—	146.28	—	146.87
26	3.94	86.4	3.95	85.40	3.95	86.19
27	4.08	66.3	4.08	66.11	4.10	65.99
28	0.96/1.37	36.8	0.93/1.36	36.55	0.95/1.37	36.56
29	1.89	32.3	1.86	32.16	1.88	32.15
30	3.27	76.8	3.23	76.86	3.26	76.65
31	1.81	28.8	1.82	28.64	1.82	28.60
32	1.38/2	27.5	1.42/2.01	27.33	1.39/1.99	27.32
33	1.361.66	31.2	1.39	30.95	1.29	30.56
34	—	97	—	97.88	—	97.29
35a/b	1.43/1.61	37	1.25/1.97	46.18	1.43/1.62	36.85
36	1.53/1.88	19.8	4.02	64.91	1.55/1.89	19.59
37a/b	1.49/1.55	26.5	1.43/1.84	35.99	1.52	26.33
38	3.51/3.71	61.3	3.64	59.70	3.52/3.71	61.20
39	0.93	11.1	0.94	10.98	0.93	10.89
40	1.05	16.6	0.99	16.45	1.06	16.47
41	5.04/5.38	112.6	5.06/5.37	112.60	5.06/5.38	112.47
42	1.11	17.1	1.08	16.80	1.10	16.83
43	1.72	23.1	1.74	23.04	3.99	65.65
44	1.31	27.9	1.32	27.94	1.32	27.65