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4-ETHYL-3-METHYL-5-(2-NITRO-ETHYL)-1H-PYRROLE-2-CARBOXYLIC ACID TERT-BUTYL ESTER 4-ETHYL-3-METHYL-5-(2-NITRO-ETHYL)-1H-PYRROLE-2-CARBOXYLIC ACID TERT-BUTYL ESTER