Abstract: | Molecules of the title compound, C18H20N2O3, are linked into ribbons by N—H·O and N—H·N hydrogen bonds. Stereochemical comparison with Ro 15‐1788 (viz. ethyl 8‐fluoro‐5,6‐dihydro‐5‐methyl‐6‐oxo‐4H‐imidazo1,5‐a]1,4]benzodiazepine‐3‐carboxylate) has identified three electronegative N and O atoms in the molecule as features likely to be responsible for its activity as a benzodiazepine‐receptor antagonist. |