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5-methylnaphtho[1,2-b][1]benzothiole
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S,S-dioxybenzonaphtho<2,1-d>thiophene-5-carboxylic acid methyl ester

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S,S-dioxy-5-bromobenzonaphtho<2,1-d>thiophene

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S,S-dioxybenzonaphtho<2,1-d>thiophene-5-carboxylic acid ethyl ester