A new ureido-substituted amino acid,conopsamide A(1),has been isolated from an ethanolic extract of the tubers of Gymnadenia conopsea.Its structure was elucidat
Valuable chiral N-Boc-β-benzyl-β-amino acid was concisely synthesized via construction of chiral NBoc-3-benzyl-5-oxoisoxazolidine through cross-metathesis/con