US PATENT SUBCLASS 536 / 28.5
.~.~.~.~.~.~ Nitrogen, other than nitro or nitroso, bonded directly to the 4-position, and chalcogen bonded directly to the 2-position of the diazine ring (e.g., cytidines, etc.)

Current as of: June, 1999
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536 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1.11  DF  .~ Carbohydrates or derivatives {15}
18.7  DF  .~.~ Nitrogen containing {13}
22.1  DF  .~.~.~ N-glycosides, polymers thereof, metal derivatives (e.g., nucleic acids, oligonucleotides, etc.) {12}
28.1  DF  .~.~.~.~ N-glycosides wherein the N is part of a six-membered hetero ring (e.g., diazines, etc.) {3}
28.4  DF  .~.~.~.~.~ The N-hetero ring is a 1,3-diazine ring, including hydrogenated (e.g., pyrimidines, etc.) {2}
28.5.~.~.~.~.~.~ Nitrogen, other than nitro or nitroso, bonded directly to the 4-position, and chalcogen bonded directly to the 2-position of the diazine ring (e.g., cytidines, etc.) {2}
28.51  DF  .~.~.~.~.~.~.~> Having chalcogen, carbonyl, or thiocarbonyl bonded directly to the 4-position substituent nitrogen
28.52  DF  .~.~.~.~.~.~.~> Halogen or alkyl group of 1-5 carbon atoms bonded directly to the 5-position of the diazine ring

DEFINITION

Classification: 536/28.5

Nitrogen, other than nitro or nitroso, bonded directly to the 4-position, and chalcogen bonded directly to the 2-position of the diazine ring (e.g., cytidines, etc.):

(under subclass 28.4) Compounds wherein nitrogen, other than nitro or nitroso, is bonded directly to the 4-position and chalcogen (i.e., oxygen, sulfur, selenium or tellurium) is bonded directly to the 2-position of the diazine ring.

(1) Note. Examples of compounds provided for herein are: [figure]