Table 2. ¹³C NMR chemical shifts (p.p.m.) of 2, 4, 6a and 6b in CDCl₃ at 27°C.

Chemical shifta	Compound
	2	4	6a	6b
C-1′	88.68	90.73	89.41	89.63
C-2′	74.61	75.97	76.05	75.86
C-3′	71.56	72.33	72.71	72.60
C-4′	84.86	85.95	85.52	85.53
C-5′	63.87	63.58	6 3.78	63.75
C-6	153.06	155.27	147.30	145.91
C-4	144.00	147.42	143.26	143.15
C-5	121.37	119.97	123.06	122.71
C-2	147.24	152.59	147.85	147.99
C-8	139.93	137.72	135.06	135.09
1-Me	37.67		36.84	36.90
6-R		27.31	37.20	43.59
				16.95
NOEDIF	↓1-Me→	↓6-Me→	↓H-2→	↓1-Me→
	H-2↑(2%)	H-2(no NOE)	1-Me↑(2%)	H-2↑(2%)
GHMBC	1-Me→H-2	C-5→H-8	1-Me→H-2	1-Me→H-2
	C-5→H-8	C-8→H-1′	C-5→H-8	C-5→H-8
	C-8→H-1′		C-8→H-1′	C-8→H-1′
	C-6→1-Me C-2→1-Me		C-6→6-Me + 1-Me	C-6→6-CH2 + 1-Me
			C-2→1-Me	C-2→1-Me

^aTypical shifts of the monomethoxytrityl group: 158.70, 144.08, 135.18, 130.42, 128.38, 127.90, 127.05, 113.23, 86.83 and 55.24.