You can tune the pH from 1 to 14 by using the "pH indicator gauge" slider; the color scale chosen for cyanidin is displayed by the fully customized BulletGauge indicator shown in the upper part of the output section alongside the chemical nomenclature for the molecular ionic species (e.g. flavylium cation). The corresponding molecular structure is shown in the lower part according to the selected options (2D or 3D visualization, with or without indices and with or without hydrogen atoms in the 2D molecular plot).

The corresponding molecular structures have been plotted starting from the corresponding Simplified Molecular Input Line Entry Specification (SMILES) reported in the Initialization section. Since it is not easy for chemoinformatics beginners to devise the correct SMILES string for complex organic molecules like anthocyanins, the AI-based web application Decimer [5] has been used to associate the correct SMILES string to the screenshots of molecular structures depicted in the references.