138865-77-7 Boc-bgat-prooh Boc-val-ser(bzl)-gln-asn-tyr(brz)-pro-OH Boc-valyl-benzylseryl-glutaminyl-asparaginyl-(brz)tyrosyl-proline L-Proline, 1-(O-(((4-bromophenyl)methoxy)carbonyl)-N-(N2-(N2-(N-(N-((1,1-dimethylethoxy)carbonyl)-L-valyl)-O-(phenylmethyl)-L-seryl)-L-glutaminyl)-L-asparaginyl)-L-tyrosyl)- tert-Butyloxycarbonyl-valyl-(benzyl)seryl-glutaminyl-asparaginyl-(brz)tyrosyl-proline