This invention features conjugates, degradable linkers, compositions, methods of synthesis, and applications thereof, including galactosamine and N-acetyl galactosamine derived conjugates of biologically active compounds, including antibodies, antivirals, chemotherapeutics, peptides, proteins, hormones,...http://www.google.ca/patents/US7491805?utm_source=gb-gplus-sharePatent US7491805 - Conjugates and compositions for cellular delivery
