Sentence: Capecitabine and oxaliplatin have been shown to be as effective as fluorouracil and cisplatin , respectively .
Drug combination annotation:
[{'class': 'POS', 'spans': ['Capecitabine', 'oxaliplatin'], 'is_context_needed': True}, {'class': 'POS', 'spans': [2, 3], 'is_context_needed': True}]