CC(C)(C[Sn](CC(C)(C)C1=CC=CC=C1)(CC(C)(C)C1=CC=CC=C1)O[Sn](CC(C)(C)C1=CC=CC=C1)(CC(C)(C)C1=CC=CC=C1)CC(C)(C)C1=CC=CC=C1)C1=CC=CC=C1