This molecule features a bicyclic core composed of a five-membered ring A (A1-A2-A3-A4-A5) and a six-membered ring B (B1-B2-B3-B4-B5-B6). Atoms A1, A2, and A4 are nitrogens, while the remaining atoms in both rings are carbons. A1 is double-bonded to A5, and A2 is double-bonded to A3; A3 bears a methyl group. Ring B shares two atoms with ring A: B1 corresponds to A4 and B2 corresponds to A5. In ring B, B3 is double-bonded to B4, and B5 is double-bonded to B6. At B5, an amide substituent (-C(=O)-N-) is attached, where the amide's nitrogen is part of a five-membered pyrrolidine ring. Taking this linkage nitrogen as position 1 (N-1), the pyrrolidine ring forms a spiro system at position 3 (C-3) with an oxygen-containing, saturated six-membered ring (tetrahydropyran), in which C-3 is at the para position of the oxygen.