28313
We provide evidence that fluorescent pirenzepine derivatives , with the M1 antagonist fused to the Bodipy [ 558 / 568 ] fluorophore via spacers of varying lengths , exhibit orthosteric / allosteric binding properties at muscarinic M1 receptors .
 pirenzepine, Bodipy [ 558 / 568 ]
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 pirenzepine, Bodipy [ 558 / 568 ]