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Pentacycloundecylamine ( PCU ) derived compounds have been shown to be promising lead structures for the development of novel drug candidates aimed at a variety of neurodegenerative and psychiatric diseases .
 Chemical: Pentacycloundecylamine; Chemical: PCU
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: Pentacycloundecylamine; Chemical: PCU