21092
Compound 1 represents a rare naturally occurring isocoumarin derivative with 4 - substitution , but no substituent at the 3 - position .
 Chemical: isocoumarin
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: isocoumarin 
Answer:
 Chemical: isocoumarin