| 544 / | 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 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} |
| 72 | DF | .~.~.~.~ Plural oxazine rings {2} |
| 78 | DF | .~.~.~.~.~ Plural morpholine rings (i.e., plural fully hydrogenated 1, 4-oxazine rings) {6} |
| 79 | DF | .~.~.~.~.~.~ Polycyclo ring system {1} |
| 80 | DF | .~.~.~.~.~.~.~ Ring nitrogen in the polycyclo ring system {1} |
| 81 |  | .~.~.~.~.~.~.~.~ Four or more ring nitrogens in the polycyclo ring system |