1400
When the E ( max ) and EC ( 50 ) values were compared with those for carbamazepine and rifampin , estradiol was found to be as potent an inducer of CYP2B6 as rifampin and carbamazepine .
 Chemical: carbamazepine; Chemical: rifampin; Chemical: estradiol; Chemical: rifampin; Chemical: carbamazepine
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: carbamazepine; Chemical: rifampin; Chemical: estradiol; Chemical: rifampin; Chemical: carbamazepine