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4-Pyridineacetic acid28356-58-330 % similar 4-(Benzyloxycarbonylamino)butyric acid5105-78-230 % similar Bz-glu-oh6094-36-630 % similar 4-Amino-3-phenylbutyric acid hydrochloride3060-41-130 % similar 4-Nitrobenzenebutanoic acid5600-62-430 % similar N-(4-Aminobenzoyl)-beta-alanine7377-08-430 % similar