| 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 |
| 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} |
| 84 | DF | .~.~.~ Five-membered ring containing two N's (9/6503; 9/6503B2; 9/6503B2G; 9/6503B2K; 9/6503B2R) {3} |
| 85 | | .~.~.~.~ N in 1 and 3 ring positions (9/6506; 9/6506G; 9/6506K; 9/6506R) {2} |
| 86 | DF | .~.~.~.~.~> Five-membered ring is condensed or bridged to a carbocyclic ring system (9/6506V) |
| 87 | DF | .~.~.~.~.~> N atom of ring is bonded directly to a P atom or is indirectly bonded to a P atom other than through a ring atom of the five-membered ring (9/6506E) |