MW: 457.23. Purity ≥98% by HPLC. CID-5721353 is a B-Cell Lymphoma 6 Inhibitor (BCL6 inhibitor). disrupted BCL6/corepressor complexes in vitro and in vivo; and was shown to bind the critical site within the BTB groove. This compound could induce expression of BCL6 target genes and kill BCL6-positive DLBCL cell lines. In xenotransplantation experiments; the compound was non-toxic and potently suppressed DLBCL tumors in vivo.