The diagram shows the repeating unit of a synthetic polyester.

State the name or chemical formula of the small molecule that is released when the monomers react to form the ester links in this polymer.
Practise Edexcel GCSE Chemistry Polymers with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.