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crystal data
The preliminary single-crystal data and powder pattern are reported for C.I. Pigment Yellow 1, α-(1-hydroxyethylidene)acetanilide-α-azo-(4′-methyl-2′-nitrobenzene), C17H16N4O4 (C.I. 11680). The powder pattern has been indexed from the single-crystal dimensions; the problems of multiple indexing have been reduced by comparison with single-crystal intensities.