Chemistry is traditionally divided into organic and inorganic chemistry. category: benzofuran, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 16859-59-9
3-Hydroxyphthalide, C8H6O3, reacts with dibutyltin oxide to give bis{mu 3-oxo-(mu-2-formylbenzoato-O:O?)-(2-formylbenzoato-O) bis[dibutyltin(IV)]}, [Sn4(C4H9)8-(C8H 5O3)4(mu-O)2], in which the four Sn atoms are all five-coordinated to three O and two C atoms arranged at the corners of a distorted trigonal bipyramid. The equatorial Sn – mu3-O distances are in the range 2.039 (2)-2.048 (2) A and are significantly shorter than the axial Sn – mu3-O distances of 2.170 (3) and 2.182 (2) A. The Sn – Ocarboxylate bonds are all axial and have distances in the range 2.204 (3)-2.271 (3) A, which are inversely correlated with the respective C – O bond distances. The mean Sn – C distance is 2.136 (6) A. 3-Hydroxyphthalide undergoes ring opening to give the anion of 2-formylbenzoic acid which bonds to the Sn atoms. The structure of 3-hydroxyphthalide is stabilized by O -H…O hydrogen bonds [O…O = 2.766 (1) A] which link the molecules in a zigzag chain parallel to b.
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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H1467O – PubChem