29558
Two series of 5 ' - triphenylmethyl ( trityl ) - substituted thymidine derivatives were synthesized and tested against Leishmania infantum axenic promastigotes and amastigotes .
 Chemical: 5 ' - triphenylmethyl ( trityl ); Chemical: thymidine
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: 5 ' - triphenylmethyl ( trityl ), thymidine 
Answer:
 Chemical: 5 ' - triphenylmethyl ( trityl ); Chemical: thymidine