(2S)-2-azaniumyl-5-[[(2R)-1-oxido-1-oxo-3-sulfanylpropan-2-yl]amino]-5-oxopentanoate (2S)-2-azaniumyl-5-[[(1R)-2-oxido-2-oxo-1-(sulfanylmethyl)ethyl]amino]-5-oxo-pentanoate (2S)-2-ammonio-5-[[(1R)-1-(mercaptomethyl)-2-oxido-2-oxoethyl]amino]-5-oxopentanoate (2S)-2-ammonio-5-keto-5-[[(1R)-2-keto-1-(mercaptomethyl)-2-oxido-ethyl]amino]valerate (2S)-2-azaniumyl-5-[[(2R)-1-oxido-1-oxo-3-sulfanyl-propan-2-yl]amino]-5-oxo-pentanoate ZINC03870040