CAS 80-09-1 appears in our catalog under these names: Bis(4-hydroxyphenyl) Sulfone, >95% (HPLC), Bisphenol S, SDP, Bis(4-hydroxyphenyl) sulfone, 99% , 4,4'-Sulfonyldiphenol, 99.7%. Offered by: TRC, Dr. Ehrenstorfer, GLPBio, Thermo Scientific (Alfa Aesar), Thermo Scientific (Acros). Available pack sizes: 10g, 1g, 100mg, 1000g, 250g, 500g, 25g, 100g.