ETHYL 6,6-DIMETHYL-3-(METHYLSULFONYL)-4-OXO-4,5,6,7-TETRAHYDROBENZO[C]THIOPHENE-1-CARBOXYLATE;ethyl 6,6-dimethyl-3-(methylsulphonyl)-4-oxo-4,5,6,7-tetrahydrobenzo[c]thiophene-1-carboxylate
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