Synthesis, identification of artificial antigen of catalpol and preliminary study of immunogenicity Synthesis and identification of artificial antigen of forsythin Key techniques in artificial antigen synthesis of active small molecule in Chinese materia medica Key techniques in artificial antigen synthesis of active small molecule in Chinese materia medica Synthesis and identification of artificial antigens of paneoniflorin Synthesis and identification of artificial antigen of loganin and preliminary study on its immunogenicity