Table 3.

Electronic transitions in tucatinib

No.	Wavelength (nm)	Osc. Strength	Symmetry	Major contributions
1	309.24	0.44	Singlet-A	HOMO → LUMO (90%)
2	267.56	0.26	Singlet-A	H-2 → LUMO (12%), HOMO → L + 2 (60%)
3	265.44	0.0032	Singlet-A	H-6 → LUMO (84%)