Like how intramolecular aldol condensations can occur in diketones, intramolecular Claisen condensations can also occur in diesters. This reaction, known as the Dieckmann cyclization, works best for 1,6-diesters and 1,7-diesters due to angle strain considerations in the final cyclic beta-keto ester product. Symmetric diesters form only one product, while assymetric esters form two. The following ester is asymmetric. Which structure represents one of two possible Dieckmann cyclization products?