13468
In contrast , pi electrons of OH ( - ) - coordinated Zn complex are localized on the coumarin moiety .
 Chemical: OH ( - ); Chemical: Zn; Chemical: coumarin
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: OH ( - ), Zn, coumarin 
Answer:
 Chemical: OH ( - ); Chemical: Zn; Chemical: coumarin