14781
Astonishingly , we have found that protonation of CPT takes place at a higher concentration of macrocycle ( >= 50 mu M ) when the 2 : 1 stoichiometric complex develops .
 Chemical: CPT
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: CPT