EP2391354A1 - COATED TABLETS OF 6-(5-CHLORO-2-PYRIDYL) -5-[ (4-METHYL-1-PIPERAZINYL) CARBONYLOXY]-7-OXO-6, 7-DIHYDRO-5H-PYRROL O [3,4-B] PYRAZINE AND METHODS FOR MEASURING EFFECTIVENESS OF COATING