A class of natural products with a characteristic structure containing a pyrrolizidine ring and an alkaloid moiety.
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(3S,5S)-5-(((tert-butyldimethylsilyl)oxy)methyl)-3-methyldihydrofuran-2(3H)-one
(2'R,3S,4R)-5-<2'-methoxy-2'-(trifluoromethyl)phenylacetoxy>-2,3,4-trimethyl-3,4-methylenedioxy-2-pentanol
