| 549 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
|
| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {1} |
| * | DD | .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {2} |
| 1 | DF | .~.~ Sulfur containing hetero ring (e.g., thiiranes, etc.) {9} |
| 29 | DF | .~.~.~ The hetero ring is five-membered {13} |
| 81 |  | .~.~.~.~ Halogen attached directly to the hetero ring by nonionic bonding {1} |
| 82 | DF | .~.~.~.~.~> Three or more halogens attached directly to the hetero ring by nonionic bonding |