2,3:6,7-Dibenzosuberen-4-on-1 2,3:6,7-Dibenzotropone 2222-33-5 5H-Dibenzo[a,d]cyclohepten-5-one 5H-Dibenzo[a,d]cycloheptenone Dibenzo[a,d]cyclohepten-5-one Dibenzosuberone NSC86151 WLN: L C676 BVJ