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The 3H-indole-2(1H)-one moiety of C]sH15NO5 is essentially planar, the C(2)--C(3) distance being 1.510 (7) ,~. The molecules are linked through hydrogen bonds forming isolated dimers. CommentThe study of the structural features of isatin (1), (Palenik, Koziol, Katritsky & Fan, 1990) and some of its derivatives such as (2) (Zukerman-Schpector, Castellano, Pinto, Da Silva & Barcellos, 1992) and (3) (Zukerman-Schpector, Pinto, Da Silva & Barcellos, 1993) led to the observation that the The 3H-indole-2-one moiety is essentially planar: Oav = 0.014 A [O,v = (7".id~ 1.458 (7) C ( Data were corrected for Lorentz, polarization and absorption effects. The structure was solved by direct methods. Refinement was by full-matrix least squares. H atoms were included as fixed contributors; those of the 3H-indole-2(1H)-one moiety were found in difference synthesis and the remaining H atoms were placed in calculated positions. Two overall isotropic temperature factors were refined, one for each group of H atoms.Programs used were: SHELXS86 (Sheldrick, 1985), SHELX-76 (Sheldrick, 1976) and ORTEP (Johnson, 1965 AbstractThe crystal structure of the title compound was determined by X-ray diffraction. The skeleton of the molecule is all trans and the molecules form a layer