Systems chemistry is the science of studying networks of interacting molecules, to create new functions from a set of molecules with different hierarchical levels and emergent properties. Systems chemistry is also related to abiogenesis. Systems chemistry is a branch of chemistry, where the focus does not lie on the individual chemical components but rather on the overall network of interacting molecules and on their emergent properties. Hence, it combines the classical knowledge of structure, reactions and interactions of molecules together with a systems approach inspired by systems biology and systems science.