Table 2.

¹H (500 MHz) and ¹³C (125 MHz) NMR Date of Act-X₂ (2) in CDCl₃^a.

	Ring-A			Ring-B
	Position	δC, type	δH (J in Hz)	Position	δC, type	δH (J in Hz)
Thr	1	168.7, C		1	168.8, C
	2	55.0, CH	4.55 (m)	2	54.8, CH	4.48 (m)
	3	74.7, CH	5.15 (m)	3	74.6, CH	5.24 (m)
	4	17.2, CH3	1.14 (d, 6.4)	4	17.7, CH3	1.26 (d, 7.3)
	NH		7.17 (d, 7.2)	NH		7.67 (d, 6.1)
Val	1	173.5, C		1	174.0, C
	2	58.5, CH	3.57 (dd, 9.3, 6.3)	2	57.2, CH	3.70 (dd, 10.4, 6.3)
	3	31.9, CH	2.10 (m)	3	31.7, CH	2.09 (m)
	4	18.9, CH3	0.90 (d, 6.8)	4	18.8, CH3	0.89 (d, 6.8)
	5	19.2, CH3	1.12 (d,6.8)	5	19.2, CH3	1.15 (d, 6.8)
	NH		7.68 (d, 6.2)	NH		8.19 (d, 5.9)
Pro	1	173.1, C		1	172.7, C
	2	56.4, CH	5.95 (d, 8.9)	2	54.3, CH	6.55 (d, 11.0)
	3	31.0, CH2	1.84 (m), 2.75 (m)	3	41.9, CH2	3.85 (m), 2.33 (m)
	4	23.0, CH	2.24 (m)	4	208.8, C
	5	47.4, CH2	3.91 (m), 3.74 (m)	5	52.9, CH2	4.55 (m), 3.89 (m)
Sar	1	166.0, C		1	165.9, C
	2	51.3, CH2	4.72 (d, 17.3), 3.62 (d, 17.3)	2	51.3, CH2	4.57 (d, 17.3), 3.62 (d, 17.3)
MeVal	NMe	34.8, CH3	2.88 (s)	NMe	34.9, CH3	2.89 (s)
	1	166.5, C		1	166.3, C
	2	71.3, CH	2.68 (m)	2	71.5 CH	2.68 (m)
	3	26.9, CH	2.68 (m)	3	27.0, CH	2.68 (m)
	4	21.6, CH3	0.94 (d, 5.8)	4	21.7, CH3	0.97 (d, 5.5)
	5	19.1, CH3	0.74 (d, 5.8)	5	19.1, CH3	0.73 (d, 5.5)
	NMe	31.7, CH3	2.92 (s)	NMe	31.9, CH3	2.93 (s)
chromophore	1	101.7, C
	2	147.4, C
	3	179.0, C
	4	113.6, C
	4a	145.0, C
	5a	140.5, C
	6	127.8, C
	7	130.3, CH	7.35 (d, 7.8)
	8	126.2, CH	7.60 (d, 7.8)
	9	132.1, C
	9a	129.1, C
	10a	145.9, C
	11	167.4, C
	12	7.8, CH3	2.24 (s)
	13	15.1, CH3	2.55 (s)
	14	172.7, C

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