The absolute configuration of 1 was also determined
by LC-MS, which showed an identical retention time of the
chiral derivative of its sugar unit after acid hydrolysis to that of
the authentic L-rhamnose derivative. On the basis of the
aformentioned analyses, the structure of 1 was established as 3′-
hydroxyphloretin 2″-α-O-L-rhamnopyranoside and named
glycyphyllin B.