You are an excellent linguist. Please extract the triplet from this sentence, the triplet is [head entity, relation, tail entity], the element relation denotes the relationship between head entity and tail entity, I will provide you the definition of the triplet you need to extract, the sentence from where your extract the triplets (head entity, relation, tail_entity) and the output format. the relation must in my predefined relation set: ('ANTAGONIST', 'ACTIVATOR', 'DOWNREGULATOR', 'PRODUCT-OF', 'AGONIST'). response Format: head entity|relation|tail entity. And the retrieved example may constitutes noise information or not.