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CAS 258267-22-0 is the registry number for Tetramethyl 5',5'-dimethyl-5',6'-dihydrospiro[1,3-dithiole-2,1'-thiopyrano[2,3-c]quinoline]-2',3',4,5-tetracarboxylate, 95%. Offered by: Combi-blocks. Available pack sizes: 5g, 1g.