| 546 / | 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) {1} |
| 1 | DF | .~.~ Hetero ring is six-membered consisting of one nitrogen and five carbons {24} |
| 255 | DF | .~.~.~ Plural pyridine or partially hydrogenated pyridine rings {6} |
| 257 | DF | .~.~.~.~ Pyridine or partially hydrogenated pyridine rings are bonded directly to each other {2} |
| 260 |  | .~.~.~.~.~ Metal containing catalyst utilized |