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13C
NMR
4
5,6,7‐Trisubstituted flavones
2
<sup>13</sup>C
2
Additivity rule
2
Atoms
2
Carbon
2
Chemical shift
2
Chemometric analysis
2
Conformational Analysis
2
Molecular Mechanics
2
N-Oxides
2
Nuclear magnetic resonance
2
Nuclear magnetic resonance spectroscopy
2
Polysubstituted flavonoids Gomphrena martiana
2
Position of N-oxide
2
Pyrazine N-oxides
2
Structure elucidation
2
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1
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2
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3
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4