Sentence: The present study was designed to test the effects of chronic combined treatment with low doses of an angiotensin converting enzyme inhibitor ( perindopril ) and of the diuretic indapamide in spontaneously hypertensive rats ( SHR ) .
Drug combination annotation:
[{'class': 'POS', 'spans': ['perindopril', 'indapamide'], 'is_context_needed': True}]