Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Paul E. Coffey and Karl-Heinz Drauz and Stanley M. Roberts and John Skidmore and John A. Smith,β-Peptides as catalysts: poly-β-leucine as a catalyst for the Juliá–Colonna asymmetric epoxidation of enones,Chemical Communications,1359-7345,Royal Society of Chemistry (RSC),2001,,22,2330,https://cir.nii.ac.jp/crid/1363107369360293504,https://doi.org/10.1039/b106368p