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Two types of modifications , namely , 2 ' - O , 4 ' - C - methylene - beta - d - ribofuranose ( beta - d - LNA ) and 2 ' - O , 4 ' - C - methylene - alpha - l - ribofuranose ( alpha - l - LNA ) , have been shown to yield RNA and DNA duplex - like structures , respectively .
 Chemical: 2 ' - O , 4 ' - C - methylene - beta - d - ribofuranose; Chemical: 2 ' - O , 4 ' - C - methylene - alpha - l - ribofuranose
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: 2 ' - O , 4 ' - C - methylene - beta - d - ribofuranose; Chemical: 2 ' - O , 4 ' - C - methylene - alpha - l - ribofuranose