MADURAHYDROXYLACTONE

The data acquisition for the title compound, 3,9,11,14,15-pentahydroxy -7-methoxy-10-methyl- hydronaphthaceno[1,2-f]isobenzofuran-1,8,13-trio ne acetonitrile solvate, C(26)H(18)0(10).C2H3N, was carried out using an image-plate detector [T = 293 K, R = 0.149, wR = 0.120 for 4211 uni que image-plate data with /F/ > 1 sigma(F)] and also using a scintilla tion detector [T = 193 K, R = 0.132, wR = 0.121 for 1910 unique data > 1 sigma(F)]. It was not possible to solve the phase problem with the scintillation detector data set, the average I/sigma being too small. The structure analysis corrects the molecular structure of madurahydro xylactone suggested ambiguously by spectroscopic methods. Three of the five hydroxy groups are involved in intramolecular hydrogen bonding.