Sentence: The combination of mezlocillin and an aminoglycoside produced synergy more often than did carbenicillin plus an aminoglycoside .
Drug combination annotation:
[{'class': 'POS', 'spans': ['mezlocillin', 'aminoglycoside'], 'is_context_needed': False}, {'class': 'COMB', 'spans': [1, 3], 'is_context_needed': True}]