| 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} |
| 67 | DF | .~.~ Exactly three N atoms as only hetero atoms in ring (9/6515) {2} |
| 71 |  | .~.~.~ Five-membered ring containing three N and two C atoms (9/6518; 9/6518G; 9/6518R) {3} |
| 72 | DF | .~.~.~.~> Five-membered ring is condensed or bridged to a carbocyclic ring system (9/6518V) |
| 73 | DF | .~.~.~.~> C atom of ring is bonded directly to a P atom or is bonded directly to a hetero atom other than N and which hetero atom is directly bonded to a P atom (9/6518K) |
| 74 | DF | .~.~.~.~> N atom of ring is bonded directly to a P atom or is bonded indirectly to a P atom other than through a ring atom of the five-membered ring (9/6518E) |