Table 2 1 H in Iridoid glucosides in the genus Sutera (Scrophulariaceae) as chemotaxonomic markers in tribe Limoselleae

Table 2 1 H (800 MHz) and 13 C NMR (100 MHz) spectra of 18 and model compounds. Atom2′′′′- O -Acetyl-angoroside A (19)Angoroside A(18)aTubuloside A (17)Echinacoside (16)Aglucone1 H13C13C13C13C1131.5131.8131.6131.626.71 (d 2.0)117.2117.3117.4117.33146.1146.3147.1146.24144.7144.9145.0144.856.67 (d 8.1)116.3116.5116.6116.466.57 (dd 8.1/2.0)121.3121.5121.6121.472.79 (m)36.536.836.836.784.01/3.71 (m)72.372.572.672.5Centr. Glc1′4.35 (d 8.0)104.1104.4103.3104.32′3.37 (dd 8.0/9.3)76.176.475.076.33′3.79 (obsc)81.681.881.981.74′4.86 (obsc)70.570.770.870.75′3.67 (obsc)75.075.176.374.96′3.50/3.80 (obsc)68.869.269.369.53′-Rha1″5.17 (d 1.7)103.1103.3102.6103.12″3.90 (dd 1.7/3.4)72.372.371.772.53″3.59 (dd 3.4/9.5)72.072.672.372.24″3.29 (obsc)73.874.073.973.95″3.57 (obsc)70.470.770.770.56″1.07 (d 6.2)18.518.618.718.56′-Glyc(Ara)(Ara)(Ara)(Glc)(Glc)1′′′′4.38 (d 7.2)102.7105.2104.3104.82′′′′4.96 (dd 7.2/9.0)73.672.575.475.23′′′′3.62 (obsc)72.374.376.377.94′′′′3.78 (obsc)69.869.771.771.65′′′′3.48/3.83 (obsc)67.066.978.278.06′′′′62.762.8Caffeoyl1‴127.7127.8127.9127.82‴7.05 (d 2.0)115.2115.5115.1115.43‴146.9147.1146.4146.94‴149.8150.1150.0149.95‴6.77 (d 8.1)116.5116.8116.7116.66‴6.95 (dd 8.1/2.0)123.2123.5123.4123.3β‴7.55 (d 15.9)148.0148.4148.1148.3α‴6.25 (d 15.9)114.7114.8115.4114.9CO'′′168.0168.5168.2168.6AcetylCH31.98 (s)21.221.5CO172.3172.3 a Data from Li et al. (2011) (150 MHz).