12556
Polymer supported dichlorophosphate ( PEG - OPOCl ( 2 ) ) is an efficient green catalyst for the electrophilic substitution reaction of indole with aromatic aldehydes , in neat condition , to afford an excellent yield of bis ( indolyl ) methanes with short reaction time , at room temperature .
 dichlorophosphate, PEG - OPOCl ( 2 ), indole, aromatic aldehydes, bis ( indolyl ) methanes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 dichlorophosphate, PEG - OPOCl ( 2 ), indole, aromatic aldehydes, bis ( indolyl ) methanes