WISWESSER LINE NOTATION, also referred to as WLN, invented by William J. Wiswesser in 1949, was the first line notation capable of precisely describing complex molecules . It was the basis of ICI Ltd 's CROSSBOW database system developed in the late 1960s. It was also the tool used to develop the CAOCI (Commercially Available Organic Chemical Intermediates) database, the datafile from which Accelrys' (successor to MDL) ACD file was developed. WLN is still being extensively used by BARK Information Services. Descriptions of how to describe molecules as WLN have been published in two books.
* L66J BMR& DSWQ IN1&1 : 6-dimethylamino-4-phenylamino-naphthalene-2-sulfonic acid * ZR CVQ : 3-aminobenzoic acid * QZ2&2&2 : 3-ethylpentan-3-ol
* ^ Wiswesser, William J. (1982). "How the WLN began in 1949 and how it might be in 1999". J. Chem. Inf. Comput. Sci. 22 (2): 88–93. doi :10.1021/ci00034a005 . * ^ Wiswesser, William J. (1968). "107 years of line-formula notations (1861-1968)". Journal of Chemical Documentation . 8 (3): 146-150. doi :10.1021/c160030a007 . * ^ Wiswesser, William J (1954). A line-formula chemical notation. Cromwell. * ^ Smith, Elbert George (1968). The Wiswesser line-formula chemical notation. McGraw-Hill. * ^ Dalke, Andrew (October 15, 2003). "WLN – History of Chemical Nomenclature". Retrieved 2006-12-17.