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Molecular structure of 4 (thermal ellipsoids represent 30% probability; hydrogen atoms on carbons omitted for clarity). Selected bond distances (Å) and angles (deg): S(1)–C(1), 1.7256(18); S(1)–C(40), 1.834(4); C(2)–C(3), 1.365(2); S(2)–C(2), 1.7078(18); S(3)–C(3), 1.7120(18); S(2)–B(1), 2.027(2); S(3)–B(1), 2.031(2); B(1)–C(33), 1.611(3); B(1)–S(2)–C(2), 94.96(8); S(2)–C(2)–C(3), 123.01(14); S(2)–B(1)–S(3), 104.64(9); C(33)–B(1)–C(34), 117.05(16).
