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The title compound, C20H14O2S, has been obtained in two monoclinic forms, which differ in their unit-cell dimensions, compactness of packing and conformation. Pairwise association of mol­ecules occurs via complementary O—H...O hydrogen bonding.

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In both title structures, C40H32N4Si and C40H32N4Si·3C4H8O, the angles around the Si atom deviate significantly from the tetra­hedral value [104.34 (7)-116.63 (7)° in the nonsolvate and 99.91 (15)-116.85 (15)° in the solvate]. The amino H atoms in the solvated structure are involved in hydrogen bonding with two of the tetra­hydro­furan solvent mol­ecules.
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