22139
This family , which does not contain the highly basic amino group usually present in other sigma 1R ligands , showed high selectivity over the sigma 2 receptor ( sigma 2R ) .
 Chemical: amino
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: amino