It wouldn't be 3-butyl-2 methyl HEPTANedioic acid? If you count the number of carbon chains, there is one that is 6 carbons long and there is one that is 7 carbons long. What do you think?
I did a Google search for "organic chemistry nomenclature builder" and the first like takes you to a sketch program and after I drew it out it was named 3-butyl-2-methyladipic acid.