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An increasing accuracy of the calculated Delta Gow was observed in the following order : GB1 ~ PB < GB7 << MST < SMD ~ COSMO - RS with a clear distinction identified between MM - and QM - based models , although for the set excluding three largest molecules , the differences among COSMO - RS , MST , and SMD were negligible .
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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:
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