2,8-Dichloro-6,12-diphenyldibenzo[b,f][1,5]diazocine-d10 is an isotope analog of 2,8-Dichloro-6,12-diphenyldibenzo[b,f][1,5]diazocine (D434065). 2,8-Dichloro-6,12-diphenyldibenzo[b,f][1,5]diazocine is synthesized from 2-aminobenzophenones (A603490) with a Lewis acid as condensing agent.