4-[(α-N-pentanoylamino)cyclopentamidomethyl]-2'-carboxamidobiphenyl

4'-((2-butyl-4-oxo-1,3-diazaspiro[4.4]non-1-en-3-yl)methyl)-[1,1'-biphenyl]-2-carboxamide

2-butyl-3-{2'-[2-(1-methyl-1-phenyl-ethyl)-2H-tetrazol-5-yl]-biphenyl-4-ylmethyl}-1,3-diaza-spiro[4.4]non-1-en-4-one

3-[4-bromobenzyl]-2-n-butyl-1,3-diazaspiro[4.4]non-1-en-4-one

2-(N-三苯基甲基-四唑-5-基)-苯硼酸