3GY2 HYDROLASE, BOVINE BETA-TRYPSIN, LIGAND, PROTEIN-LIGAND COMPLEX, PROTEIN-LIGAND INTERACTION, CALCIUM, DIGESTION, DISULFIDE BOND, METAL- BINDING, PROTEASE, SECRETED, SERINE PROTEASE, ZYMOGEN A COMPARATIVE STUDY ON THE INHIBITION OF BOVINE BETA-TRYPSIN BY BIS- BENZAMIDINES DIMINAZENE AND PENTAMIDINE BY X-RAY CRYSTALLOGRAPHY AND ITC