10873
By dissecting S1 , we identified the compound 4 with a 2 - hydroxypyridine core as the starting fragment .
 Chemical: 2 - hydroxypyridine
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: 2 - hydroxypyridine