A delivery agent for delivering a biologically active agent to a warm-blooded animal includes a hydrophobic moiety covalently bonded to a hydrophilic moiety. The hydrophobic moiety can include bile acids, sterols, or hydrophobic small molecules. The hydrophilic moiety can include α-amino acids, dipeptides...http://www.google.com/patents/US7906137?utm_source=gb-gplus-sharePatent US7906137 - Delivery agents for enhancing mucosal absorption of therapeutic agents
