| Main / NMR Chemical ShiftsNMR chemical shifts can be computed using gauge-including atomic orbitals at the following levels 
 for closed-shell molecules. NMR chemical shift calculations using CI methods or CC methods with higher than triple excitations are possible via the MRCC code by M. Kállay interfaced to CFOUR (see Interface to MRCC). | 
 CFOUR is partially supported by the U.S. National Science Foundation.
 CFOUR is partially supported by the U.S. National Science Foundation.