Crystal Data for C.I. Pigment Yellow 74

The single-crystal data and X-ray powder pattern are reported for C. I. Pigment Yellow 74 [α-(1-hydroxy-ethylidene)acet-2-methoxyanilide-α-azo-(2′-methoxy-4′-nitrobenzene)]. The powder pattern has been indexed from the cell dimensions given by single-crystal measurements; the problems of multiple indexing have been reduced by comparing the powder with observed single-crystal intensities.