2516
Patch - clamp and Ca ( 2 + ) - influx results indicate that ( - ) - reboxetine does not activate h alpha 4 beta 2 nAChRs via interaction with the orthosteric sites , but inhibits agonist - induced h alpha 4 beta 2 activation by a noncompetitive mechanism .
 Ca ( 2 + ), ( - ) - reboxetine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Ca ( 2 + ), ( - ) - reboxetine