In the title molecule. C18H16ClN3O2. the seven-membered ring adopts an envelope conformation with the flap atom deviating by 0. 801 (5) Å from the mean plane formed by the remaining non-H atoms. https://www.lightemupsequences.com/hot-mega-Esko-Nexus-HeightMaster-Vented-Safety-Helmet-big-savings/