The dienophile shown reacts with buta-1,3-diene in a Diels-Alder reaction. Which statements about the adduct are correct?

The compound shown is dimethyl maleate (Z). The reaction is stereospecific, so the cis esters end up cis on the cyclohexene ring, giving dimethyl cis-cyclohex-4-ene-1,2-dicarboxylate. This molecule has two stereocentres related by a mirror plane, so it is meso and achiral. A racemic pair would arise only from dimethyl fumarate (trans).