| 544 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | 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 having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) {6} |
| 63 | DF | .~.~.~ Six-membered hetero ring consists of oxygen, nitrogen and carbon (e.g., 1,2-oxazines, etc) {8} |
| 98 | DF | .~.~.~.~ 1,4-Oxazines {2} |
| 106 | DF | .~.~.~.~.~ Morpholines (i.e., fully hydrogenated 1,4-oxazines {10} |
| 111 |  | .~.~.~.~.~.~ Additional nitrogen containing hetero ring (e.g., thiazetidine, etc.) {5} |
| 112 | DF | .~.~.~.~.~.~.~> Triazine ring {1} |
| 114 | DF | .~.~.~.~.~.~.~> Diazine ring {3} |
| 124 | DF | .~.~.~.~.~.~.~> Six-membered ring consisting of one nitrogen and five carbons (e.g., pyridine, etc.) {3} |
| 132 | DF | .~.~.~.~.~.~.~> Five-membered hetero ring having two or more ring hetero atoms of which at least one is nitrogen {4} |
| 141 | DF | .~.~.~.~.~.~.~> Five-membered hetero ring consisting of one nitrogen and four carbons {1} |