Table 1.

NMR spectroscopic data (600 MHz, methanol-d₄) for compounds 2 and 4 referenced against the solvent residual peak for methanol-d₄: ¹H = 3.31 ppm, ¹³C = 49.00 ppm. For proton and carbon denotations, see Scheme 1.

	compound 2			compound 4
#	δC, type	δH	HMBC (H → C) a	#	δC, type	δH	HMBC (H → C) a
1	132.62, C			1′″	132.82, C
2	116.29, C			2′″	116.39, C
3	114.19, C			3′″	114.24, C
4	143.76, C			4′″	143.68, C	6.84,s	2, 3, 6, 7
5	146.20, C			5′″	146.08, C
6	115.03, CH	6.07,s	8, 9, 11, 12, 14	6′″	115.16, CH	6.03,s	8, 9, 11, 12, 14
7	39.65, CH2	4.13,s	5, 7, 9, 10, 11, 12, 14	7′″	39.82, CH2	4.05,s	5, 7, 9, 10, 11, 12, 14
1′	128.97, C			4″	130.64, C		4, 5, 6', 7
2′	115.49, C			3″	116.20, C
3′	143.76, C			2″	144.44, C		8, 9, 11, 12, 14
4′	145.82, C			1″	145.54, C
5′	115.55, CH	6.96,s	2, 3, 6, 7	6″	117.25, CH	6.84,s	2, 3, 6, 7
6′	133.48, C			5″	130.17, C
7′	63.21, CH2	4.36,s	4, 5, 7	7″	71.94, CH2	4.20,s	4, 5, 6', 7

^a HMBC correlations, optimized for 8 Hz, are from proton(s) to the indicated carbon.