Table 1.

¹H (600 MHz) and ¹³C (150 MHz) NMR Date of Act-X_0β (1) in CDCl₃^a.

	Ring-A			Ring-B
	Position	δC, type	δH (J in Hz)	Position	δC, type	δH (J in Hz)
Thr	1	168.8, C		1	169.0, C
	2	55.5, CH	4.81 (dd, 7.0, 2.5)	2	54.9, CH	4.49 (dd, 6.5, 2.8)
	3	74.7, CH	5.24 (m)	3	75.4, CH	5.24 (m)
	4	17.7, CH3	1.28 (d, 6.3)	4	17.8, CH3	1.24 (d, 6.0)
	NH		7.44 (d, 6.9)	NH		7.50 (d, 6.4)
Val	1	173.5, C		1	173.3, C
	2	58.9, CH	3.57 (dd, 10.2, 3.5)	2	58.1, CH	3.55 (dd, 8.9, 4.3)
	3	32.0, CH	2.16 (m)	3	31.9, CH	2.12 (m)
	4	19.2, CH3	0.75 (d, 2.7)	4	19.2, CH3	0.74 (d, 2.7)
	5	19.2, CH3	0.96 (d, 7.4)	5	19.0, CH3	0.94 (d, 1.6)
	NH		8.17 (d, 6.2)	NH		7.91 (d, 5.5)
Pro	1	173.2, C		1	173.0, C
	2	57.0, CH	5.97 (d, 9.2)	2	56.5, CH	6.05 (d, 9.6)
	3	31.2, CH2	1.84 (m), 2.78 (m)	3	31.4, CH2	4.13 (m), 3.95 (m)
	4	23.0, CH2	2.06 (m), 2.26 (m)	4	70.0, CH	4.70 (m)
	5	47.6, CH2	3.85 (m), 3.73 (m)	5	54.7, CH2	3.56 (m), 3.08 (m)
Sar	1	166.5, C		1	166.5, C
	2	51.3, CH2	4.72 (d, 17.4), 3.63 (d, 17.4)	2	51.5, CH2	4.55 (d, 17.4), 3.59 (d, 17.4)
MeVal	NMe	35.0, CH3	2.87 (s)	NMe	35.1, CH3	2.87 (s)
	1	167.6, C		1	167.7, C
	2	71.3, CH	2.71 (d, 9.3)	2	71.4, CH	2.67 (d, 9.4)
	3	27.0, CH	2.78 (m)	3	27.0, CH	2.64 (m)
	4	21.7, CH3	0.96 (m)	4	21.7, CH3	0.94 (m)
	5	19.4, CH3	0.75 (d, 2.7)	5	19.2, CH3	0.74 (d, 3.1)
	NMe	39.5, CH3	2.95 (s)	NMe	39.3, CH3	2.94 (s)
chromophore	1	102.7, C
	2	147.1, C
	3	179.1, C
	4	113.6, C
	4a	145.0, C
	5a	140.7, C
	6	128.5, C
	7	130.4, CH	7.35 (d, 7.8)
	8	126.2, CH	7.64 (d, 7.8)
	9	131.3, C
	9a	129.6, C
	10a	146.1, C
	11	166.2, C
	12	7.9, CH3	2.22 (s)
	13	15.3, CH3	2.54 (s)
	14	173.0, C

^aThr, Threonine; Val, Valine; Pro, Proline; Sar, Sarcosine.