Peaks 15 and 60 were confirmed as isorhamnetin-O-diglucoside-sulfate and isorhamnetin-3-O-sinapoylglucoside-
sulfate-7-O-glucoside, respectively. Among the four isorhamnetins found, three were reported for the first time
in the genus Brassica; only isorhamnetin-O-glucoside-sulfate has been previously reported