serine,valyl,arginyl,alanyl
Serine
917601-06-0D-Serine,N-[2-[4-[(2R,3R)-1-(4-fluorophenyl)-3-[[2-(4-fluorophenyl)-2-oxoethyl]thio]-4-oxo-2-azetidinyl]phenoxy]acetyl]-
917601-05-9D-Serine,O-(1,1-dimethylethyl)-N-[2-[4-[(2R,3R)-1-(4-fluorophenyl)-3-[[2-(4-fluorophenyl)-2-oxoethyl]thio]-4-oxo-2-azetidinyl]phenoxy]acetyl]-,1,1-dimethylethyl ester