| .H+ |
Increases the number of total hydrogens (total number of hydrogen substituents). |
| .H- |
Decreases the number of total hydrogens (total number of hydrogen substituents). |
| .v+ |
Increases the number of valence (total bond order). |
| .v- |
Decreases the number of valence (total bond order). |
| .X+ |
Increases the number of connections (number of substituents including hydrogens). |
| .X- |
Decreases the number of connections (number of substituents including hydrogens). |
| .R- |
Increases the number of rings (number of rings the atom is a member of). |
| .R+ |
Decreases the number of rings (number of rings the atom is a member of). |
| .r+ |
Increases the smallest ring size (size of the smallest ring the atom is a member of). |
| .r- |
Decreases the smallest ring size (size of the smallest ring the atom is a member of). |
| .rb+ |
Increases ring bond count (number of ring bonds next to the atom). |
| .rb- |
Decreases ring bond count (number of ring bonds next to the atom). |
| .s+ |
Increases substitution count (number of non-hydrogen and isotopic hydrogen substituents). |
| .s- |
Decreases substitution count (number of non-hydrogen and isotopic hydrogen substituents). |
| .h+ |
Increases the number of implicit hydrogens (number of implicit hydrogen substituents). |
| .h- |
Decreases the number of implicit hydrogens (number of implicit hydrogen substituents). |
| .D+ |
Increases degree (equivalent to substitution count: number of non-hydrogen and isotopic hydrogen substituents). |
| .D- |
Decreases degree (equivalent to substitution count: number of non-hydrogen and isotopic hydrogen substituents). |
| .u |
Marks as an unsaturated atom (atom has double, triple or aromatic bond). |
| .a/A |
Marks as aromatic/aliphatic (has aromatic bond). |