5659
Metabolomics and mass isotopomer analysis as a strategy for pathway discovery : pyrrolyl and cyclopentenyl derivatives of the pro - drug of abuse , levulinate .
 Chemical: pyrrolyl; Chemical: cyclopentenyl; Chemical: levulinate
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: pyrrolyl; Chemical: cyclopentenyl; Chemical: levulinate