| 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} |
| 75 | DF | .~.~ Exactly two N's as only hetero atom in ring (9/645) {2} |
| 76 | DF | .~.~.~ Six-membered ring containing two N and four C atoms (9/6509; 9/6509B2; 9/6509B2E; 9/6509B2G; 9/6509B2K; 9/6509B2R) {3} |
| 77 |  | .~.~.~.~ N in 1 and 3 ring positions (9/6512; 9/6512E; 9/6512G; 9/6512R) {3} |
| 78 | DF | .~.~.~.~.~> Ring is condensed or bridged to a carbocyclic ring system (9/6512V) |
| 79 | DF | .~.~.~.~.~> C atom of ring is directly bonded to a P atom (9/6512K; 9/6512K4) |
| 80 | 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 (9/6512K2) |