Answer Happy

Could you please carefully with steps explain to me how my professor got this diels-alder product from that starting diene and dienophile. Thank you in advance! I'm trying to understand how syn addition works here in diels-alder reactions
H ОMe Meo + •OME ОMe H H | I Dimethyfumarate (a transdienophile) Dimethytyclohex 4-enetrans1,2- dicarboxylate