Recombinant Anti-albumin x Anti-IL-6R Bispecific Antibody (scDiabody-CH3) is a fusion protein of two scDiabodies connected together by a CH3 region. In single-chain Diabodies, an additional connecting linker is introduced between chains of the anti-albumin/anti-IL-6R diabody. The scDiabody with two specificities is fused to each of the CH3 chains to extend half-life. This BsAb can act as PK-modulated receptor antagonist. It is designed for the research of Lupus, rheumatoid arthritis therapy.