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3-(ETO-CARBONYL-ET)-ME-PYRROLE-2,4-DICARBOXYLIC ACID 2-BZL ESTER 4-TERT-BU ESTER 3-(ETO-CARBONYL-ET)-ME-PYRROLE-2,4-DICARBOXYLIC ACID 2-BZL ESTER 4-TERT-BU ESTER