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Sitagliptin defuoro impurity 3851307-12-545 % similar N-(tert-Butoxycarbonyl)glycine4530-20-545 % similar Boc-L-tyrosine3978-80-145 % similar 1,1-Dimethylethyl N-[(1R)-1-(hydroxymethyl)-2,2-diphenylethyl]carbamate155836-48-944 % similar N-((1,1-Dimethylethoxy)carbonyl)-4-(trifluoromethyl)-L-phenylalanine114873-07-344 % similar N-[(1,1-Dimethylethoxy)carbonyl]-4-methyl-D-phenylalanine80102-27-844 % similar (βR)-4-Bromo-β-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]benzenepropanoic acid220498-04-444 % similar 1-(Phenylmethyl) hydrogen N-((1,1-dimethylethoxy)carbonyl)-L-glutamate30924-93-744 % similar Boc-L-serine3262-72-443 % similar (2S)-2-[[(1,1-Dimethylethoxy)carbonyl]amino]butanoic acid34306-42-843 % similar N-[(1,1-Dimethylethoxy)carbonyl]-D-serine6368-20-343 % similar 4-Amino-N-[(1,1-dimethylethoxy)carbonyl]-D-phenylalanine164332-89-243 % similar Boc-L-4-fluorophe41153-30-443 % similar (S)-3-((tert-Butoxycarbonyl)amino)-3-(4-chlorophenyl)propanoic acid479064-90-943 % similar N-Boc-4-chloro-D-phenylalanine57292-44-143 % similar N-tert-Butoxycarbonyl-4-iodo-L-phenylalanine62129-44-643 % similar (S)-N-Boc-3-amino-3-phenylpropanoic acid103365-47-543 % similar tert-Butoxycarbonylalanine15761-38-343 % similar (R)-N-Boc-3-amino-3-phenylpropanoic acid161024-80-243 % similar Boc-β-alanine3303-84-243 % similar