?1-N-Boc-3-Azetidinecarboxylic acid , its cas register number is 142253-55-2. It also can be called n-boc-3-azetidine carboxylic acid ; n-boc-azetidine-3-carboxylic acid ; n-alpha-t-butoxycarbonyl-azetide-3-carboxylic acid ; n-alpha-t-butoxycarbonyl-azetidine-3-carboxylic acid ; n-alpha-t-boc-l-azetidine-3-carboxylic acid ; boc-aze(3)-oh ; boc-azetidine-3-carboxylic acid and so on.