Sentence: The next broad-spectrum drug was ethionamide , followed by ansamycin , rifampin , capreomycin , kanamycin , streptomycin and ethambutol .
Drug combination annotation:
[{'class': 'COMB', 'spans': ['ethionamide', 'rifampin', 'capreomycin', 'kanamycin', 'streptomycin', 'ethambutol', 'ansamycin'], 'is_context_needed': True}]