Question: What are the existing chemical esters ?
Answers:
answer_text: Methyl butyrate [http://www.thegoodscentscompany.com/data/rw1008721.html Methyl butyrate], thegoodscentscompany.com 
answer_text: Ethyl acetate
answer_text: Amyl acetate
answer_text: Benzyl acetate
answer_text: Propyl propanoate
answer_text: Methyl butyrate
answer_text: Butyl butyrate
answer_text: Ethyl pentanoate
answer_text: Ethyl benzoate