Table 3

¹³C-NMR chemical shifts^3-a of glucuronides of (−)-epicatechin metabolites

	(−)-Epicatechin-5-O-β-glucuronide	3′-O-methyl-(−)-epicatechin-5-O-β-glucuronide
C-2	79.1	79.2
C-3	66.4	66.4
C-4	28.4	28.4
C-4a	103.3	103.2
C-5	157.2	157.1
C-6	—^3-b	—
C-7	156.1	156.1
C-8	—	—
C-8a	156.1	156.0
C-1′	131.9	131.9
C-2′	115.4	111.8
C-3′	144.8	145.4
C-4′	144.6	148.2
C-5′	117.1	116.3
C-6′	119.9	120.4
C-1"	101.4	101.4
C-2"	73.5	73.5
C-3"	75.6	75.6
C-4"	72.1	72.1
C-5"	76.0	76.1
C-6"	173.2	173.2
OCH₃		56.9

↵3-a Chemical shifts are expressed in ppm down field from the signal of TPS in D₂O. Coupling constants in Hz are in parentheses.
↵3-b —, no signal was observed probably because of replacement of hydrogen by deuterium.