What reactants would you need to synthesize nylon 4, 7?

"The two numbers refer to the number of carbon atoms in the diamine and diacid used to make up the nylon polymer.

In this case, nylon 4,7 is made up of 1,4-diaminobutane (putrescine), and 1,7-heptanedioic acid (pimelic acid). However, these two compounds won't react. Typically, the acid chloride, not the acid, is used in nylon synthesis, meaning you'd likely need 1,7-heptanedioyl chloride.

To draw these compounds, the diamine is a 4 carbon chain w/ a NH2 at each end. The diacid chloride is a 5 carbon chain w/ a COCl at each end."