| Orbital |
sp, sp2, and sp3 (sp, sp2, and sp3, respectively) |
| Number of attached non-hydrogen atoms |
0, 1, 2, 3, and 4 (×0, ×1, ×2, ×3, and ×4, respectively) |
| Ring |
Part of 3-, 4-, 5-, and 6-membered ring (r3, r4, r5, and r6, respectively) |
| Delocalized electrons and mobile hydrogens |
Part of a conjugate bond (conj), a resonance bond (res), an aromatic ring (ar), an aromatic 5-membered ring (ar5), and an aromatic 6-membered ring (ar6) |
| Miscellaneous properties |
electrically negative atoms (neg), nitrogen atom of an amide (namide), and carbon atom of a carboxylate group (cx). |
| Electrostatic properties |
cation (ep1), anion (ep2), donor of a hydrogen bond (ep3), acceptor of a hydrogen bond (ep4), polar, which can be both donor or acceptor of a hydrogen bond (ep5), hydrophobic (ep6), and undefined properties (ep7). |
