CAS 16858-02-9 appears in our catalog under these names: N,N,N’,N’-Tetrakis(2-pyridylmethyl)-1,2-ethylenediamine, TPEN/ 99.79% (existing batch purity), TPEN, N,N,N',N'-Tetrakis-(2-pyridylm , N,N,N',N'-Tetrakis(2-pyridylmethyl)ethylenediamine, >97.0%(T). Offered by: TRC, TargetMol, GLPBio, Thermo Scientific (Alfa Aesar), TCI. Available pack sizes: 100mg, 250mg, 50mg, 25mg, 200mg, 10mM (in 1ml dmso), 500mg, 300mg.