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tetramethyl 2,2a,2a1,3,4,4a,5a,7a-octahydro-1H-1,5,2,4-(epiethane[1,1,2,2]tetrayl)cyclobuta[f]cyclopenta[cd]indene-5,6,7,7b-tetracarboxylate
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tetramethyl (1R,2R,3S,4R,5S,8R,9S,10R,11S,12S)-hexacyclo[10.2.1.02,11.03,10.04,9.05,8]pentadeca-6,13-diene-4,6,7,9-tetracarboxylate
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