GC-MS analysis permitted the identification of 2-methylbutyric (mba),n-hexanoic (hexa),n-decanoic (deca), n-dodecanoic (dodeca), and trans-cinnamic (cna) a cids, as the esterifying moeties. The glycosidic acid was acetylated and
methylated to give a residue that was purified by C 18 reversed-phase HPLC, affording compound 4 as the major glycosidic acid, which was identified as the peracetylated methyl ester derivative of operculinic acid A (5), (11S)-jala pinolic acid 11-O-β-D-glucopyranosyl-(1f3)-O-[R-L-rhamnopyranosyl-(1f4)]-O-[R-L-rhamno-pyranosyl-(1f4)]-O-[R-L-rhamnopyranosyl-(1f2)]-β-D-fucopyranoside, previously obtained fromI. operculata, 17 I. leptophylla, 18 and I. murucoides.1
GC-MS analysis permitted the identification of 2-methylbutyric (mba),n-hexanoic (hexa),n-decanoic (deca), n-dodecanoic (dodeca), and trans-cinnamic (cna) a cids, as the esterifying moeties. The glycosidic acid was acetylated andmethylated to give a residue that was purified by C 18 reversed-phase HPLC, affording compound 4 as the major glycosidic acid, which was identified as the peracetylated methyl ester derivative of operculinic acid A (5), (11S)-jala pinolic acid 11-O-β-D-glucopyranosyl-(1f3)-O-[R-L-rhamnopyranosyl-(1f4)]-O-[R-L-rhamno-pyranosyl-(1f4)]-O-[R-L-rhamnopyranosyl-(1f2)]-β-D-fucopyranoside, previously obtained fromI. operculata, 17 I. leptophylla, 18 and I. murucoides.1
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