OEGetPsi

double OEGetPsi(const OEHierResidue &res)
double OEGetPsi(const OEChem::OEAtomBase *atom,
                unsigned assume=OEAssumption::Default)

Returns the \(\psi\) (psi) angle in radians for a residue specified by its OEHierResidue class or by any OEAtomBase from the residue.