Sennoside B

(9S) -9-[ (9R) -2-carboxy-4-hydroxy-10-oxo-5-[ (2S,3R,4S,5S,6R) -3,4,5-trihydroxy-6- (hydroxymethyl) oxan-2-yl]oxy-9H-anthracen-9-yl]-4-hydroxy-10-oxo-5-[ (2S,3R,4S,5S,6R) -3,4,5-trihydroxy-6- (hydroxymethyl) oxan-2-yl]oxy-9H-anthracene-2-carboxylic acid

C1=CC2=C(C(=C1)O[C@H]3[C@@H]([C@H]([C@@H]([C@H](O3)CO)O)O)O)C(=O)C4=C([C@@H]2[C@H]5C6=C(C(=CC=C6)O[C@H]7[C@@H]([C@H]([C@@H]([C@H](O7)CO)O)O)O)C(=O)C8=C5C=C(C=C8O)C(=O)O)C=C(C=C4O)C(=O)O