Robuta

https://webbook.nist.gov/cgi/inchi/InChI%3D1S/C16H18O2S/c1-11-5-7-13(3)15(9-11)19(17%2C18)16-10-12(2)6-8-14(16)4/h5-10H%2C1-4H3 2,2',5,5'-Tetramethyldiphenylsulfone