As stated in DGR 220.127.116.11, the step in selecting the Proper Shipping Name is in the order of (1) Single entry for well-defined substance, (2) Generic entry for well-defined group, (3) Specific entry from the n.o.s. Table 4.1.A, (4) General entry from the n.o.s. Table 4.1.A.
This case is a choice between UN 1123 Butyl acetates and UN 1263 Paint related material. UN 1123 Butyl acetates which falls under (1) is the correct choice. UN 1263 Paint related material falls under (2).