3-((Bromoacetyl)amino)-L-alanine monohydrobromide 77215-58-8 L-Alanine, 3-((bromoacetyl)amino)-, monohydrobromide N(3)-(Bromoacetyl)-2,3-diaminopropanoic acid N(3)-Bromoacetyl-2,3-diaminopropanoic acid NSC 326172 PADPA