. 2021 Jan 19;6(4):2846–2855. doi: 10.1021/acsomega.0c05142

Table 1. ¹H and ¹³C NMR Chemical Shift of Luteolin and Luteolin Oligomer I (MeOD-d₄, 500 MHz).

	Luteolin		Luteolin oligomer I (major product)
Position	¹H δ (ppm), J (Hz)	¹³C δ (ppm)	¹H δ (ppm), J (Hz)	¹³C δ (ppm)
2		164.63		164.61
3	6.51 (1H, s)	102.53	6.51 (1H, s)	102.50
4		182.49		182.23
5		161.84		161.94
6	6.18 (1H, d, 2.3)	98.77	6.17 (1H, m)	98.74
7		164.96		165.01
8	6.41 (1H, d, 2.3)	93.66	6.41 (1H, d, 2.3)	93.60
8A				177.03
9		158.05		157.40
10		103.97		103.66
1′		122.36		122.40
2′	7.35 (1H, m)	112.85	7.35 (1H, m)	112.73
3′		145.69		145.85
4′		149.65		149.65
4′A				154.38
5′	6.88 (1H, dd, 8.9, 2.0)	115.45	6.87 (1H, dd, 8.9, 2.0)	115.38
6′	7.36 (1H, m)	118.99	7.36 (1H, m)	118.81

Table 1. 1H and 13C NMR Chemical Shift of Luteolin and Luteolin Oligomer I (MeOD-d4, 500 MHz).