参考文献

Ligand Pharmaceuticals Incorporated Patent: US5688808 A1, 1997 ; US 5688808 A Title/Abstract Full Text Show Details Ligand Pharmaceuticals Incorporated Patent: US5693646 A1, 1997 ; US 5693646 A Title/Abstract Full Text Show Details Ligand Pharmaceuticals Incorporated Patent: US5693647 A1, 1997 ; Title/Abstract Full Text Show Details Ligand Pharmaceuticals Incorporated Patent: US5696127 A1, 1997 ; US 5696127 A