ペネム (化合物)
“Synthetic studies of carbapenem and penem antibiotics. II. Synthesis of 3-acetyl-2-azetidinones by (2 + 2) cycloaddition of diketene and Schiff bases”. Chemical & Pharmaceutical Bulletin 40 (5): 1094-7. (May 1992). doi:10.1248/cpb.40.1094. PMID 1394625.