New alkaloids from ants: Identification and synthesis of (3R,5S,9R)‐3‐butyl‐5‐(1‐oxopropyl)indolizidine and (3R,5R,9R)‐3‐butyl‐5‐(1‐oxopropyl)indolizidine, constituents of the poison gland secretion in Myrmicaria eumenoides (hymenoptera, formicidae)

Abstract
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