| 987 / | HD | ORGANIC COMPOUNDS CONTAINING A Bi, Sb, As, OR P ATOM OR CONTAINING A METAL ATOM OF THE 6TH TO 8TH GROUP OF THE PERIODIC SYSTEM |
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| 30 | DF | PHOSPHORUS COMPOUNDS (9/02; 9/06) {15} |
| 49 | DF | .~ Ring is devoid of a P or a metal atom and contains at least one hereto atom (O, S, N, Se, or Te) and may or may not contain C (9/547; 9/6524) {9} |
| 90 | DF | .~.~ Single N as only hetero atom in ring (9/553; 9/568) {6} |
| 92 | DF | .~.~.~ Six atoms in ring containing the single N atom (9/576) {5} |
| 99 |  | .~.~.~.~ Pyridine ring (9/58; 9/58G; 9/58R) {3} |
| 100 | DF | .~.~.~.~.~> C atom of ring is bonded directly to a P atom (9/58K; 9/58K4) |
| 101 | DF | .~.~.~.~.~> C atom of ring is bonded directly to a hetero atom other than N and which hetero atom is bonded directly to a P atom (9/58K2) |
| 102 | DF | .~.~.~.~.~> N atom of ring is bonded directly to a P atom or indirectly to a P atom other than through a ring atom of the pyridine ring (9/58E) |