The dataset utilized in this study was curated from the Materials Project database (version 2023.11.01), filtered for unit cells containing 40 atoms or fewer. A total of 32,525 structures were obtained through the Materials Project API, ensuring that all selected structures were experimentally observed and possessing an energy above the convex hull of less than 0.25 eV per atom. Structures with cell lengths exceeding 20 Å were also excluded. Structures that naturally exist as gases at standard room temperature, such as H₂, O₂, and noble gases, were systematically excluded from the dataset to avoid isolated neutral molecular fragments when generating crystal structures. To rigorously evaluate the model's generalizability to unseen data, a chronological split was applied. Entries registered before August 2, 2018, were allocated to the training and validation set, while those added after this date were used as the test set. Detailed distributions of properties, including the number of entries per year, crystal system, and number of atoms, are provided in Supplementary Figure .