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Results of ab initio self-consistent field (SCF) calculations of 1,2-dithiosquaric acid (3,4-dihydroxy-3-cyclobutene-l,2-dithione) are reported. The ZZ isomer is found to be the most stable of the three isomers. An isodesmic energy analysis has been carried out at the HF 6-31G ∗ //6-31G ∗ level for the three planar isomers. The three isomers have positive isodesmic energies or small...
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