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ETHYL 3-CYANO-2-HYDROXY-1,4,4A,5,6,7,8,8A-OCTA-H-4-OXO-1-NAPHTHALENECARBOXYLATE ETHYL 3-CYANO-2-HYDROXY-1,4,4A,5,6,7,8,8A-OCTA-H-4-OXO-1-NAPHTHALENECARBOXYLATE