5375
In this study , we investigated enhancers with amino acids ( proline , sarcosine , alanine , beta - alanine , and glycine ) attached to hydrophobic chain ( s ) via a biodegradable ester link .
 Chemical: amino acids; Chemical: proline; Chemical: sarcosine; Chemical: alanine; Chemical: beta - alanine; Chemical: glycine; Chemical: ester
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: amino acids; Chemical: proline; Chemical: sarcosine; Chemical: alanine; Chemical: beta - alanine; Chemical: glycine; Chemical: ester