2-Propenoicacid, 3-(4-hydroxyphenyl)-, 6''-ester with 3-[(6-deoxy-2-O-b-D-glucopyranosyl-a-L-mannopyranosyl)oxy]-2-(3,4-dihydroxyphenyl)-5,7-dihydroxy-4H-1-benzopyran-4-one