30277
W ( CO ) 6 is found to be trapped in two main families of sites differing by their symmetries ( called hereafter Oh and D2h ) .
 Chemical: W ( CO ) 6
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: W ( CO ) 6