SGR-1505 is an orally active MALT1 allosteric inhibitor. SGR-1505 inhibits MALT1 enzymatic activity and shows anti-proliferative activity in BTK inhibitor (BTKi)-sensitive and BTKi-resistant activated B cell-like diffuse large B cell lymphoma (ABC-DLBCL) cell lines. SGR-1505 can be used for research of B-cell lymphomas.