Three limonoid glycosides were isolated from Citrus unshiu peels, and their
structures were determined based on MS and NMR spectroscopic data as nomil
inic acid 17-O-beta-D-glucopyranoside (1), methyl nomilinate 17-O-beta-D-gl
ucopyranoside (2), and obacunone 17-O-beta-D-glucopyranoside (3). In partic
ular, the location of the sugar moiety was clearly determined by the B/E co
nstant linked scan FABMS method. No limonoid glycosides obtained here were
found to have antitumor activity in NCI-H292 and EL-4 cell lines, (C) 1999
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