Carbon-13 Nuclear Magnetic Resonance Spectra of Carcinogenic Polynuclear Hydrocarbons. II. Benzo[a]pyrene

13C n.m.r. signal assignments are presented for the carcinogenic polynuclear hydrocarbon benzo[a]pyrene. In addition to selective 1H decoupling, valuable information is obtained from the magnitudes of the α-, β-, and "peri" deuterium isotope shifts in the 1,3,6-trideuterio analog. The applicability of the model compound approach to signal assignment is explored in detail.