34529
Juxtaposing the designations produces the following terms for the conformers of butane ( see Alkane stereochemistry for an explanation of conformation nomenclature ) : gauche butane is syn-clinal ( + sc or - sc , depending on the enantiomer ) , anti butane is anti-periplanar , and eclipsed butane is syn-periplanar .
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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: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None