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A novel fluorescently active co - oligomer ( P1 ) was designed and prepared by alternative co - polymerization of oligo ( p - phenyleneethynylene ) ( OPE ) , possessing two cholesterol - containing side chains , and ethanediamine .
 oligo ( p - phenyleneethynylene ), OPE, cholesterol, ethanediamine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 oligo ( p - phenyleneethynylene ), OPE, cholesterol, ethanediamine