22705
These results indicate that parabens are selective agonists for ER beta over ER alpha ; their interactions with ER alpha / beta are dependent on the size and bulkiness of the alkyl groups ; and they are metabolized by carboxylesterases , leading to attenuation of their estrogenic activity .
 Chemical: parabens; Chemical: alkyl
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: parabens; Chemical: alkyl