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Furthermore , galantamine ' s binding mode disrupts the key pi - pi stacking interaction between aromatic rings of Phe19 ( chain A ) and Phe19 ( chain B ) and intermolecular hydrogen bonds seen in unbound peptide dimer .
 Chemical: galantamine; Chemical: Phe19; Chemical: Phe19; Chemical: hydrogen
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: galantamine; Chemical: Phe19; Chemical: Phe19; Chemical: hydrogen