27593
Our calculations show that the two glass surfaces differ by the relative amount of key structural sites such as NBOs , exposed ions , orthosilicate units , and small rings .
 Chemical: orthosilicate
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: orthosilicate