- This molecule comprises a fused system of a five-membered ring and a six-membered ring that share a carbon atom and a nitrogen atom.
- The five-membered ring is a 1,3,4-thiadiazole ring that contains a sulfur atom at position 1, two nitrogen atoms at positions 3 and 4, and two carbon atoms at positions 2 and 5. The atoms are designated as S1, C2, N3, N4, and C5.
- The six-membered ring is a pyrimidin consists of two nitrogen atoms and four carbon atoms, with atoms designated as N6, C7, N8, C9, C10, and C11. Note that N6 (corresponding to N4) and C7 (corresponding to C5) are shared with the five-membered ring. The ring exhibits double bonds between C7 and N8 and between C9 and C10. The carbon atom C11 forms a double bond with an oxygen atom, establishing a pyrimidone structure.
- A six-atom side chain extends from C9; the second atom in this chain is a sulfur atom, while the remaining atoms are carbon atoms. An amino group (-NH2) is attached to the fifth atom of the side chain.
