Table 1. NMR Spectroscopic Data (¹H 500 and ¹³C 125 MHz) of Oblarotenoids E (1), F (2) (CD₂Cl₂^a), and G (CDCl₃).

	1			2			3
position	δC, type	δH (J in Hz)	HMBCb	δC, type	δH (J in Hz)	HMBC	δC, type	δH (J in Hz)	HMBC
1	106.6, CH	6.31 s	C-1a, C-2, C-3, C-4a, C-12a	105.9, CH	6.54 s	C-1a, C-2, C-3, C-4a, C-12a	107.1, CH	8.32 s	C-2, C-3, C-4a, C-12a
1a	109.4, C			109.9, C			111.8, C
2	138.9, C			149.5, C			142.9, C
3	136.3, C			142.4, C			147.4, C
4	136.9, C			99.3, CH	6.46 s	C-1a, C-2, C-3	98.7, CH	6.53 s	C-1a, C-2, C-3
4a	133.2, C			149.5, C			147.5, C
6	66.8, CH2	4.65 dd (12.5, 2.6)	C-4a, C-6a, C-12a	64.0, CH2	4.58 dd (13.5, 2.6)	C-4a, C-6a, C-12a	65.0, CH2	4.96 s	C-4a, C-6a, C-12a
		4.21 br d (12.5)	C-4a,C-6a		4.46 d (13.5, 2.6)	C-4a,C-6a
6a	72.7, CH	4.94 dd (2.6)	C-1a, C-4a, C-6, C-12, C-12a	76.4, CH	4.56 br d (3.6)	C-1a, C-4a, C-6, C-12, C-12a	156.8, C
7a	163.0, C			157.5, C			156.7, C
8	100.9, CH	6.44 d (2.3)	C-7a, C-9, C-10, C-11a	100.3, CH	6.40 s	C-7a, C-9, C-10, C-11a	100.3, CH	6.83 d (2.2)	C-7a, C-9, C-10, C-11a
9	167.0, C			157.3, C			164.0, C
10	110.9, CH	6.59 dd (8.9, 2.3)	C-8, C-9, C-11a	145.3, C		C-8, C-9, C-11a	114.7, CH	7.00 dd (8.9, 2.2)	C-8, C-11a
11	129.6, CH	7.85 d (8.9)	C-7a, C-9, C-12	106.9, CH	7.25 s	C-7a, C-9, C-12	127.9, CH	8.20 d (8.9)	C-7a, C-9, C-12
11a	113.1, C			109.5, C			118.7, C
12	189.0, CO			191.3, CO			174.2, CO
12a	45.0, CH	3.81c	C-1a, C-4, C-6	67.9, C			112.3, C
OCH2O	102.7, CH2	5.97 d (1.4); 5.91 d (1.4)	C-3, C-4	101.5, CH2	5.83 d (1.4); 5.86 d (1.4)	C-2, C-3	101.5, CH2	5.96 s	C-2, C-3
OMe-2	57.2, CH3	3.73 s	C-2
OMe-9	56.2, CH3	3.81 s	C-9	56.4, CH3	3.86 s	C-9	56.0, CH3	3.92 s	C-9
OMe-10				56.5, CH3	3.88 s	C-10

^aCD₂Cl₂ was used due to the gradual color change observed in the slightly acidic CDCl₃.

^bHMBC correlations, optimized for 6 Hz, are from the stated proton(s) to the indicated carbon.

^cSignal overlapping with that of OMe-9.