| 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} |
| 90 | DF | .~.~ Single N as only hetero atom in ring (9/553; 9/568) {6} |
| 92 | | .~.~.~ Six atoms in ring containing the single N atom (9/576) {5} |
| 93 | DF | .~.~.~.~> Acridine or hydrogenated acridine ring (9/64) |
| 94 | DF | .~.~.~.~> Isoquinoline or hydrogenated isoquinoline ring (9/62) |
| 95 | DF | .~.~.~.~> Quinoline or hydrogenated quinoline ring (9/60) |
| 96 | DF | .~.~.~.~> Hydrogenated pyridine ring (9/59; 9/59G; 9/59K; 9/59K2; 9/59K4; 9/59R) {2} |
| 99 | DF | .~.~.~.~> Pyridine ring (9/58; 9/58G; 9/58R) {3} |