55.4
[]. P E Finke, et al. Orally active beta-lactam inhibitors of human leukocyte elastase. . Stereospecific synthesis and structure-activity relationships for ,-dialkylazetidin-2-ones. J Med Chem. 995 Jun 2;8():2449-62.
H02-H5-H9-H5
P26-P264-P270-P27-P280-P02+P52-P04+P40-P05+P5+P8-P0-P62+P64-P40+P2-P405-P50