Four fused benzyl rings with three linear and one angular, that can be viewed as a benzyl-phenanthrenes. Compare with NAPHTHACENES which are four linear rings.
Benz(b)Phenanthrenes,Naphthanthracenes
D015127
9,10-Dimethyl-1,2-benzanthracene
Polycyclic aromatic hydrocarbon found in tobacco smoke that is a potent carcinogen.