26434-61-7 576-19-2 Biocytin Biotinyl-L-lysine L-Lysine, N6-(5-((3aS,4S,6aR)-hexahydro-2-oxo-1H-thieno(3,4-d)imidazol-4-yl)-1-oxopentyl)- L-Lysine, N6-(5-(hexahydro-2-oxo-1H-thieno(3,4-d)imidazol-4-yl)-1-oxopentyl)-, (3aS-(3aalpha,4beta,6aalpha))-