18548
Computational prediction of ORD , ECD , and VCD allowed us to assign ( 3S , 4aR , 8S , 8aR ) AC to naturally occurring ( - ) - 1 , while ( 4aR , 8S , 8aR ) AC was assigned to ( - ) - 2 employing only ECD and VCD , because in this case ORD analysis turned out to be unsuitable for AC assignment .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None