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highly substituted aromatic natural products1 has lead us to obtain the title compound, an intermediary of a metabolite obtained from cultures of Aspergillus duricaulis.2 6-Carboxymethyl-5,7-dimethoxy-1(3H)-isobenzofuranone, 1, was obtained as colorless crystals. Its structure was determined by an X-ray crystal analysis. Data were collected on a Siemens P4/PC diffractometer. Crystallographic data, details of X-ray data collection and a structure refinement are summarized in Table 1. The intensities were collected using nickel-filtered Cu Kα radiation (λ =1.54178 Å) at room temperature, and were corrected for both Lorentz and polarization effects.3 The structure was solved by direct methods4 and refined by fullmatrix least-squares with anisotropic temperature factors for the non-hydrogen atoms. The hydrogen atoms were placed at their idealized positions and included in a structure-factor calculation with fixed isotropic thermal parameters (U=0.08 Å2). A diagram of the structure of compound 1 is shown in Fig. 1. The molecular structure with atomic numbering is shown in Fig. 2. The molecule is nearly planar.

6-Carboxymethyl-5,7-dimethoxy-1(3H)-isobenzofuranone: Crystal Structure of a Precursor of Nidulol, a Natural Product