An Acylated Pelargonidin 3-Sophoroside from the Pale-brownish Red Flowers of Ipomoea nil

A structurally new acylated anthocyanin was isolated from the pale-brownish red flowers of a duskish-2 mutant in the Japanese morning glory (Ipomoea nil or Pharbitis nil) as a major pigment together with a known anthocyanin.The new pigment was determined as pelargonidin 3-O-[2-O-(6-O-(trans-3-O-(β-glucopyranosyl)caffeoyl)-β-glucopyranosyl)-β-glucopyranoside],and the known anthocyanin was identified to be pelargonidin 3-sophoroside.