Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Tomihisa Ohta and Akio Hosoi and Shigeo Nozoe,Stereoselective hydroxylation of N-carbamoyl-L-pyroglutamate. Synthesis of (−)-bulgecinine,Tetrahedron Letters,0040-4039,Elsevier BV,1988-01-01,29,,329-332,https://cir.nii.ac.jp/crid/1874242817870894976,https://doi.org/10.1016/s0040-4039(00)80087-8