Calculate the yield of the synthesized highly substituted but-2-enoic acid esters based on the amount of starting materials used.
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(4,4'-(buta-1,3-diyne-1,4-diyl)bis(4,1-phenylene))dimethanol
(1S,3S,4R)-2-((R)-1-phenyl-ethyl)-2-aza-bicyclo[2.2.1]hept-5-ene-3-carboxylic acid ethyl ester
