127745-41-9 Biotinyl-trp-leu-beta-ala Biotinyl-tryptophyl-leucyl-beta-alanine beta-Alanine, N-(N-(N-(5-(hexahydro-2-oxo-1H-thieno(3,4-d)imidazol-4-yl)-1-oxopentyl)-L-tryptophyl)-L-leucyl)-, (3aS-(3aalpha,4beta,6aalpha))-