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MOPAC is a popular computer program used in computational chemistry. It is designed to implement semi-empirical quantum chemistry algorithms, and it runs on Windows, Mac, and Linux. MOPAC2016 is the current version. MOPAC2016 is able to perform calculations on small molecules and enzymes using PM7, PM6, PM3, AM1, MNDO, and RM1. The Sparkle model (for lanthanide chemistry) is also available. Academic users can use this program for free, whereas government and commercial users must purchase the software. MOPAC was largely written by Michael Dewar's research group at the University of Texas at Austin. Its name is derived from Molecular Orbital PACkage, and it is also a pun on the Mopac Expressway that runs around Austin. More information...

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