1 X5P 4-oxidanylidene-4-[[(2~{S})-1-oxidanyl-1-oxidanylidene-propan-2-yl]amino]butanoic acid 1.000 2 SN0 N-(3-carboxypropanoyl)-L-norvaline 0.867 3 SMG N-succinyl methionine 0.812 4 SUO N~2~-(3-carboxypropanoyl)-L-ornithine 0.812 5 ZJU N-succinyl-aspartic acid 0.812 6 MY0 (2s)-4-[1-(carboxymethyl)hydrazinyl]-2-hydroxy-4-oxobutanoic acid 0.800 7 K6V N-[(2s)-1-hydroxypropan-2-yl]butanamide 0.769 8 FWO (2s)-2-[[(3s)-3-azanyl-4-oxidanyl-4-oxidanylidene-butanoyl]amino]-4-methyl-pentanoic acid 0.765 9 NSK N-succinyl lysine 0.765 10 ZKO N-succinyl-glutamine 0.765 11 5KC (2s,3s)-2-azanyl-4-(2-hydroxy-2-oxoethylamino)-3-oxidanyl-butanoic acid 0.733 12 C4L N-butanoyl-L-homoserine 0.733 13 I38 N-(3-mercaptopropanoyl)-D-alanine 0.714