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-[2]benzofuran]-1-carboxylate tert-butyl 6-acetylspiro[1H-isobenzofuran-3,3'-azetidine]-1'-carboxylate tert-butyl 5'-acetyl-3'H-spiro[azetidine-3,1'-[2]benzofuran]-1-carboxylate tert-Butyl 5'-acetyl-3'H-spiro[azetidine-3,1'-isobenzofuran]-1-carboxylate 5-ACETYLSPIRO[AZETIDINE-3,1(3H)-ISOBENZOFURAN]-1-CARBOXYLIC ACID, 1,1-DIMETHYLETHYL ESTER Spiro[azetidine-3,1'(3'H)-isobenzofuran]-1-carboxylic acid, 5'-acetyl-, 1,1-dimethylethyl este Spiro[azetidine-3,1'(3'H)-isobenzofuran]-1-carboxylic acid, 5'-acetyl-, 1,1-dimethylethyl ester Spiro[azetidine-3,1'(3'H)-isobenzofuran]-1-carboxylic acid, 5'-acetyl-, 1,1-diMethylethyl ester