In 1991, chemists at Rice University reported that they had trapped an unstable compound called spiropentadiene using

Question:

In 1991, chemists at Rice University reported that they had trapped an unstable compound called spiropentadiene using its Diels-Alder reaction with excess 1, 3- cyclopentadiene, giving the product in the reaction shown in Fig. P15.72 on p. 738. Use the structure of this product to deduce the structure of spiropentadiene.
Fig. 15.72