9137
Following Fe ( III ) - promoted coupling with catharanthine and in situ oxidation to provide the corresponding vinblastine analogues , their evaluation provided unanticipated insights into how the structure of the vindoline subunit contributes to activity .
 Fe ( III ), catharanthine, vinblastine, vindoline
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Fe ( III ), catharanthine, vinblastine, vindoline