18127
Anionic G6 . 5 or smaller molecular weight carboxyl - , amine - , or hydroxyl - terminated dendrimers ( G3 . 5 - COOH , G4 - NH2 , G4 - OH ) on the other hand were tolerated at doses of up to 500mg / kg ( 300mg / kg in some cases ) with minimal or no signs of toxicity .
 Chemical: carboxyl; Chemical: amine; Chemical: hydroxyl; Chemical: COOH; Chemical: NH2; Chemical: OH
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: carboxyl; Chemical: amine; Chemical: hydroxyl; Chemical: COOH; Chemical: NH2; Chemical: OH