6683
Tunable polymers with polydispersities < 1 . 25 and molecular weights in the range 500 - 7700 g mol ( - 1 ) containing a catechol moiety for conjugation to metal oxide nanoparticles were prepared .
 Chemical: catechol; Chemical: metal oxide
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: catechol; Chemical: metal oxide