The 'ewin' keyword sets the default energy window for conformational energies at GFN2-xTB level in CREST, typically at 6 kcal/mol. The 'cluster' keyword is used to cluster the generated conformations, while the 'chrg' keyword designates the molecule's charge. Auto3D initially runs the default RDKit conformer engine ETKDG using SMILES as input for stereoisomer enumeration and 3D construction. The input command 'K=1000' generated 1000 conformations, which were subsequently filtered using a 0.