An early form of this representation was first developed by the organic chemist Friedrich August Kekulé von Stradonitz, while the modern form is closely related to and influenced by the Lewis (dot) structure of molecules and their valence electrons. For this reason, they are sometimes termed Kekulé structures or Lewis-Kekulé structures. Skeletal formulae have become ubiquitous in organic chemistry, partly because they are relatively quick and simple to draw, and also because the curved arrow notation used for discussions of reaction mechanism and/or delocalization can be readily superimposed.