The QM8 data set, introduced by Ramakrishnan et al. , comprises electronic spectra data for approximately 21,786 small organic molecules. It is a carefully curated subset derived from the larger QM9 data set, which includes 134,000 molecules. QM8 offers information on electronic spectra, specifically at the level of time-dependent DFT(TD-DFT) and second-order approximate Coupled Cluster (CC2), presenting the lowest two singlet transition energies and their corresponding oscillator strengths.