Extended Data Figure 3. Possible structures of α-pinene oxidation products.

a, Possible structures of HOM monomer molecules. C* was estimated using the SIMPOL method (at 293 K). Note that the volatility is less once the ring structure is open. The volatility generally decreases with increasing oxidation and decreasing temperature. b, Possible structures of HOM dimer molecules. C* was estimated using the SIMPOL method (at 293 K). Structures in boxes with asterisk(s) at the top right corner were confirmed by (*) or taken from (**) Kurtén et al.⁷⁴.