11898
Following light absorption , localization of the excitation on a single thymine leads to fast singlet - triplet crossing that populates the triplet ( 3 ) ( n pi * ) state of thymine .
 Chemical: thymine; Chemical: thymine
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: thymine; Chemical: thymine