| 3514 | 2-amino-4-[[1-(carboxymethylcarbamoyl)-2-nitrososulfanyl-ethyl]carbamoyl]butanoic acid | 
	
		| 104858 | (2S)-2-amino-4-[[(1R)-1-(carboxymethylcarbamoyl)-2-nitrososulfanyl-ethyl]carbamoyl]butanoic acid | 
	
		| 6603946 | (2R)-2-amino-4-[[(1S)-1-(carboxymethylcarbamoyl)-2-nitrososulfanyl-ethyl]carbamoyl]butanoic acid | 
	
		| 6857718 | (2S)-2-amino-4-[[(1R)-1-(carboxylatomethylcarbamoyl)-2-nitrososulfanyl-ethyl]carbamoyl]butanoate | 
	
		| 7059524 | (2S)-2-azaniumyl-4-[[(1R)-1-(carboxylatomethylcarbamoyl)-2-nitrososulfanyl-ethyl]carbamoyl]butanoate |