19471
Enantiomeric separation of racemic 4 - aryl - 1 , 4 - dihydropyridines and 4 - aryl - 1 , 2 , 3 , 4 - tetrahydropyrimidines on a chiral tetraproline stationary phase .
 Chemical: 4 - aryl - 1 , 4 - dihydropyridines; Chemical: 4 - aryl - 1 , 2 , 3 , 4 - tetrahydropyrimidines; Chemical: tetraproline
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: 4 - aryl - 1 , 4 - dihydropyridines, 4 - aryl - 1 , 2 , 3 , 4 - tetrahydropyrimidines, tetraproline 
Answer:
 Chemical: 4 - aryl - 1 , 4 - dihydropyridines; Chemical: 4 - aryl - 1 , 2 , 3 , 4 - tetrahydropyrimidines; Chemical: tetraproline