| Carbon atoms |
---|---|
C1a | R-CH3 / methyl |
C1b | R-CH2-R / methylene |
C1c | R-CH(-R)-R / tertiary carbon |
C1d | R-C(-R)2-R / quaternary carbon |
C1x | ring-CH2-ring / methylene in ring |
C1y | ring-CH(-R)-ring / tertiary carbon in ring |
C1z | ring-C(-R)2-ring / quaternary carbon in ring |
C2a | R=CH2 / alkenyl terminus carbon |
C2b | R=CH-R / alkenyl secondary carbon |
C2c | R=C(-R)2 / alkenyl tertiary carbon |
C2x | ring-CH=ring / alkenyl secondary carbon in ring |
C2y | ring-C(-R)=ring or ring-C(=R)-ring / alkenyl tertiary carbon in ring |
C3a | R#CH / alkynyl terminus carbon |
C3b | R#C-R / alkynyl secondary carbon |
C4a | R-CH=O / aldehyde carbon |
C5a | R-C(=O)-R / keto carbon |
C5x | ring-C(=O)-ring / keto carbon in ring |
C6a | R-C(=O)-OH / carboxylate carbon |
C7a | R-C(=O)-O-R / carboxylate ester carbon |
C7x | ring-C(=O)-O-ring / lactone carbon |
C8x | ring-CH=ring / aromatic secondary carbon |
C8y | ring-C(-R)=ring / aromatic tertiary carbon |
C0 | Undefined carbon |
 | Nitrogen atoms |
N1a | R-NH2 / primary amine |
N1b | R-NH-R / secondary amine |
N1c | R-N(-R)2 / tertiary amine |
N1d | R-N(-R)3+ / quaternary ammonium |
N1x | ring-NH-ring / secondary amine in ring |
N1y | ring-N(-R)-ring / tertiary amine in ring |
N2a | R=N-H / primary imine |
N2b | R=N-R / secondary imine |
N2x | ring-N=ring / secondary imine in ring |
N2y | ring-N(-R)+=ring / iminium |
N3a | R#N / nitrile |
N4x | ring-NH-ring / aromatic secondary amine |
N4y | ring-N(-R)-ring / aromatic tertiary amine |
N5x | ring-N=ring / aromatic secondary imine |
N5y | ring-N(-R)+=ring / aromatic tertiary imine |
N0 | Undefined nitrogen |
 | Oxygen atoms |
O1a | R-OH / hydroxy |
O1b | N-OH / N-hydroxy |
O1c | P-OH / P-hydroxy |
O1d | S-OH / S-hydroxy |
O2a | R-O-R / hydroxy ether |
O2b | P-O-R / hydroxy phosphate bond |
O2c | P-O-P / pyrophosphate bond |
O2x | ring-O-ring / cyclic ether |
O3a | N=O / N-oxo |
O3b | P=O / P-oxo |
O3c | S=O / S-oxo |
O4a | R-CH=O / aldehyde oxygen |
O5a | R-C(=O)-R / keto oxygen |
O5x | ring-C(=O)-ring / keto oxygen in ring |
O6a | R-C(=O)-OH / carboxylate oxygen |
O7a | R-C(=O)-O-R / carboxylate ester oxygen |
O7x | ring-C(=O)-O-ring / lactone oxygen |
O0 | Undefined oxygen |
 | Sulfur atoms |
S1a | R-SH / mercapto |
S2a | R-S-R / sulfide |
S2x | ring-S-ring / sulfide in ring |
S3a | R-S-S-R / disulfide |
S3x | ring-S-S-ring / disulfide in ring |
S4a | R-SO3 / sulfate |
S0 | Undefined sulfur |
 | Phosphorus atoms |
P1a | P-R / phosphine |
P1b | P-O / phosphate |
 | Halogen atoms |
X | F / fluoride |
 | Cl / chloride |
 | Br / bromide |
 | I / iodide |
 | Other atoms |
Z | Other atoms |