The molecule has a pyrimidine core, a six-membered aromatic ring with two nitrogens in a meta (1,3) relationship. Each of the ring carbon bears a substituents. 

Start at one nitrogen as N1, then proceed clockwise: C2 (between the two nitrogens), N3, C4, C5, and C6.

Substituents on this ring:
- C2 bears a methyl group.
- C4 bears a bromine atom.
- C5 bears a side chain that begins with a stereogenic carbon (S-configuration).
  - This chiral carbon carries:
    1) a methyl group
    2) and an ester linkage to an ethyl group. Specifically, the chiral carbon connects to a carbonyl carbon (-C(=O)-), which is further bonded to an oxygen, then to an ethyl group (-CH2-CH3).
- C6 bears a trifluoromethyl group (-CF3), that is, a methyl group with all three hydrogens replaced by fluorine atoms.