Enter CARBON chemical shift value (ppm) and MULTIPLICITY of your signals:
Allowed chemical shift range for 13C-signals is between -399.0 and +399.0 ppm
s = singulet ( Cquat ), d = doublet ( CH ), t = triplet ( CH2 ), q = quartet ( CH3 ),
e = even ( CH or CH3 ), o = odd ( Cquat or CH2 ) , ? = unknown ( any type )
Couplings to other nuclei than protons (e.g. 31P, 19F) are ignored - enter only the shift values !
e.g. a CF3-group should be given as "122.8 s 2.5"
Deviation: 1.0 to 5.0 ppm allowed, useful values are somewhere around 3 ppm