1. On the xundrug.cn/molgpka website, please input a molecule (SMILES format) and then click the predict button. You can input the SMILES string directly, or you can draw a molecule through the JME molecule editor.
2. The server extracts all ionization centers on the input molecule and predicts pKa for each ionizable group by graph-convolutional neural network. The result page shows information of all ionization centers and predicted pka.