View source for Licoricesaponin H2

==Spectroscopic Data==

{| class="wikitable" style="width:80%"

'''Free acid'''
|-
| '''M.P.'''<sup>1</sup> || 209 - 210 °C 
|-
| '''IR''' (KBr)<sup>2</sup>|| 3500-3300 (br), 2920, 1725, 1645, 1386, 1200, 1040 cm<sup>-1</sup>
|-
| '''<sup>1</sup>H-NMR''' (C<sub>5</sub>D<sub>5</sub>N, 500 MHz)<sup>2</sup>|| 0.87 (s, CH<sub>3</sub>), 1.06 (s, CH<sub>3</sub>), 1.19 (s, CH<sub>3</sub>), 1.20 (s, CH<sub>3</sub>), 1.35 (s, CH<sub>3</sub>), 1.36 (s, CH<sub>3</sub>), 1.38 (s, CH<sub>3</sub>), 3.00 (brd, ''J''= 13.0 Hz, H-18), 3.35 (dd, ''J''=4.0. 12.3 Hz, H-3), 4.97 (d, ''J''=7.6 Hz, H-1 of GlcUA I), 5.35 (d, ''J''=7.6 Hz, H-1 of GlcUA II), 5.79 (brs, H-12)
|-
| '''<sup>13</sup>C-NMR''' (C<sub>5</sub>D<sub>5</sub>N, 125MHz)<sup>1</sup>|| 105.0 (C-1 of Glc I), 106.8 (C-1 of Glc II), 128.8 (C-12), 169.0 (C-13), 180.6 (C-29), 199.4 (C-11)
|}
{| class="wikitable" style="width:80%"
'''Trimethyl ester'''
|-
| '''M.P.'''<sup>1</sup> || 169 °C 
|-
| '''IR''' (KBr)<sup>1</sup>|| 3362, 1722, 1654 cm<sup>-1</sup>
|-
| '''<sup>1</sup>H-NMR''' (C<sub>5</sub>D<sub>5</sub>N)<sup>1</sup>|| 4.95 (d, ''J''=7.3 Hz, H-1 of GlcUA I), 5.33 (d, ''J''=7.7 Hz, H-1 of GlcUA II)
|-
| '''<sup>13</sup>C-NMR''' (C<sub>5</sub>D<sub>5</sub>N, 22.5MHz)<sup>2</sup>|| C-3) 89.2, (11) 199.0, (12) 128.6, (13) 168.4, (18) 44.0, (22) 37.1, (24) 16.2, (29) 178.1, (30) 19.3, '''GlcUA I''' (1) 104.9, (2) 84.3, (3) 76.4, (4) 72.5, (5) 77.3, (6) 170.1, '''GlcUA II''' (1)106.8, (2) 76.6, (3) 77.4, (4) 72.9, (5) 77.6, (6) 170.2  
|}
<small>1) M. Yoshikawa et al., Chem.Pharm.Bull., 39, 244 (1991)., 2) M. Yoshikawa et al., Chem.Pharm.Bull., 41, 1337 (1993).</small>