Scheme 1. Synthetic route through which compound Q was produced. Reagents and reaction conditions: (a) acetone, K₂CO₃, 25 °C, 4 h; (b) ethylene glycol methyl ether, 125 °C, 3 h; (c) ethanol, 80, 3 h; (d) trifluoroacetic acid, triethylamine, 25 °C, 3 h; (e) N,N-dimethylformamide, 130 °C, 4 h.