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Chemoselective Dieckmann cyclization reactions may be used on oxazolidine and thiazolidine templates derived from various aldehydes to access bicyclic tetramates , which have potential as templates for chemical library construction .
 Chemical: oxazolidine; Chemical: thiazolidine; Chemical: aldehydes
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: oxazolidine; Chemical: thiazolidine; Chemical: aldehydes