5514
In the last decade , organocatalysis , the use of small chiral organic molecules as catalysts , has proven to be a valuable and attractive tool for the synthesis of enantiomerically enriched molecules .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None