US PATENT SUBCLASS 536 / 28.4
.~.~.~.~.~ The N-hetero ring is a 1,3-diazine ring, including hydrogenated (e.g., pyrimidines, etc.)

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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.~.~.~.~.~ The N-hetero ring is a 1,3-diazine ring, including hydrogenated (e.g., pyrimidines, etc.) {2}
28.5  DF  .~.~.~.~.~.~> 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}
28.53  DF  .~.~.~.~.~.~> Chalcogen bonded directly to the 2- and 4-positions of the diazine ring (e.g., uridine, etc.) {2}

DEFINITION

Classification: 536/28.4

The N-hetero ring is a 1,3-diazine ring, including hydrogenated (e.g., pyrimidines, etc.):

(under subclass 28.1) Compounds wherein the N-hetero ring is a 1,3-diazine ring which may be hydrogenated.

(1) Note. An example of a compound provided for herein is: [figure]