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The PEMUs were built layer - by - layer with the polycation poly ( allylamine hydrochloride ) ( PAH ) and a polyanion poly ( acrylic acid ) ( PAA ) that was modified with photoreactive 4 - ( 2 - hydroxyethoxy ) benzophenone ( PAABp ) .
 Chemical: poly ( allylamine hydrochloride ); Chemical: PAH; Chemical: poly ( acrylic acid ); Chemical: PAA; Chemical: 4 - ( 2 - hydroxyethoxy ) benzophenone
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: poly ( allylamine hydrochloride ); Chemical: PAH; Chemical: poly ( acrylic acid ); Chemical: PAA; Chemical: 4 - ( 2 - hydroxyethoxy ) benzophenone