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Memantine - sulfur containing antioxidant conjugates as potential prodrugs to improve the treatment of Alzheimer ' s disease .
 Chemical: Memantine; Chemical: sulfur
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Memantine; Chemical: sulfur