210823-74-8 28809-04-3 68295-88-5 Alanine, 3-((2-(4-pyridyl)ethyl)thio)-, L- EINECS 249-249-9 L-Cysteine, S-(2-(4-pyridinyl)ethyl)- NSC 328389 S-(2-(4-Pyridyl)ethyl)-L-cysteine S-beta-(4-Pyridylethyl)-L-cysteine