CAS 501919-59-1 appears in our catalog under these names: S2I-201, NSC 74859, S3I-201/ 99.05% (existing batch purity), NSC 74859 99%, Stat3 Inhibitor VI, S3I-201 1PC X 25MG. Offered by: TRC, GLPBio, TargetMol, Ambeed, Sigma-Aldrich. Available pack sizes: 10mg, 25mg, 50mg, 200mg, 10mM (in 1ml dmso), 5mg, 100mg, 1mg.