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A complementary approach that combines NMR measurements , analysis of X - ray and neutron powder diffraction data and advanced quantum mechanical calculations was employed to study the alpha - polymorph of L - polylactide .
 Chemical: L - polylactide
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: L - polylactide