HELP: a Fortran V computer program for obtaining the Cartesian coordinates of a single molecule from its chemical formula

A Fortran V computer program for obtaining the atomic coordinates of a single molecule from its chemical formula is presented. The program has been tested in a UNIVAC 1100 computer. The program assigns a Cartesian system to each skeletal bond and assigns each atom to its proper Cartesian system. The program lists the various types of bonds of each atom and, given the torsion angles, computes the conformation of the whole molecule. Torsion angle and atom numbering is automated by the program. Cyclic structures can also be represented. At present molecules containing hydrogen, carbon, oxygen, phosphorus, nitrogen, sulfur, silicon and halogen atoms can be represented.