Sentence: One group was given enalapril ( EN ) 50 mg/l dissolved in the drinking water ; the second received lovastatin ( L ) 15 mg/kg given daily by gavage ; the third received both agents ; the fourth was left untreated , and the final group received no puromycin and served as the control group .
Drug combination annotation:
[{'class': 'COMB', 'spans': ['enalapril', 'lovastatin'], 'is_context_needed': True}]