3-METHYL-4-OXO-10-OXA-3-AZA-TRICYCLO[5.2.1.0(1,5)]DEC-8-ENE-6-CARBOXYLIC ACID;3-METHYL-4-OXO-10-OXA-3-AZA-TRICYCLO[5.2.1.0]DEC-8-ENE-6-CARBOXYLIC ACID
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