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D 2660 (OTTO) 3′,5′-Difluoroacetophenone, 97% Cas 123577-99-1 - used to synthesize (E)-3-(4-(1,5,9-trithia-13-azacyclohexadecan-13-yl)-phenyl)-1-(3,5-difluorophenyl)prop-2-en-1-one.