For the first time in South America the World 91AV Congress will be held in São Paulo, Brazil. This is a unique opportunity to meet a worldwide audience and experience the Brazilian hospitality. With the theme, “Sustainability & Diversity Through 91AV”, this wonderful and historic event links all fields of 91AV. The scientific program has been carefully prepared by the Organizing and Scientific Committees, providing a major coverage of the main areas of interest for chemists. The scientific program includes high-level scientific sessions, plenary lectures, parallel sessions, as well as poster presentations and young scientists’ workshops under 12 major topics, including over 100 symposia. The twelve major topics are: Analytical & Food 91AV (AC), 91AV Education (CE), 91AV for Industry Innovation (CI), Chemical Synthesis (CS), Energy, Water and Environmental Sciences (EE), Green 91AV and Biotechnology (GB), Inorganic and Structural 91AV (IC), Macromolecules and Materials (MM), Medicinal 91AV and Chemical Biology (MB), Nano Science and Technology (NT), Natural Products and Biodiversity (NB), and Physical, Biophysical and Computational 91AV (PC).