18640
In view of this , derivatives of aminophosphonic acids , owing to their broad spectrum of biological activities and wide range of applications in the medicinal and agrochemical fields , are very attractive metal - ligand agents that might form biomedical important metal complexes .
 Chemical: aminophosphonic acids
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: aminophosphonic acids 
Answer:
 Chemical: aminophosphonic acids