US PATENT SUBCLASS 544 / 132
.~.~.~.~.~.~.~ Five-membered hetero ring having two or more ring hetero atoms of which at least one is nitrogen


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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}
98  DF  .~.~.~.~ 1,4-Oxazines {2}
106  DF  .~.~.~.~.~ Morpholines (i.e., fully hydrogenated 1,4-oxazines {10}
111  DF  .~.~.~.~.~.~ Additional nitrogen containing hetero ring (e.g., thiazetidine, etc.) {5}
132.~.~.~.~.~.~.~ Five-membered hetero ring having two or more ring hetero atoms of which at least one is nitrogen {4}
133  DF  .~.~.~.~.~.~.~>.~ The five-membered hetero ring has at least sulfur and nitrogen as ring hetero atoms {2}
137  DF  .~.~.~.~.~.~.~>.~ The five-membered hetero ring has at least oxygen and nitrogen as ring hetero atoms {1}
139  DF  .~.~.~.~.~.~.~>.~ 1,3-Diazole ring (including hydrogenated)
140  DF  .~.~.~.~.~.~.~>.~ 1,2-Diazole ring (including hydrogenated)


DEFINITION

Classification: 544/132

(under subclass 111) Compounds in which the additional hetero ring is five-membered having two or more ring hetero atoms, at least one of which is nitrogen.