US PATENT SUBCLASS 536 / 28.53
.~.~.~.~.~.~ Chalcogen bonded directly to the 2- and 4-positions of the diazine ring (e.g., uridine, 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}
28.53.~.~.~.~.~.~ Chalcogen bonded directly to the 2- and 4-positions of the diazine ring (e.g., uridine, etc.) {2}
28.54  DF  .~.~.~.~.~.~.~> Alkyl, or substituted alkyl, bonded directly to the 5-position of the diazine ring (e.g., thymidine, 5-methyl uridine, etc.)
28.55  DF  .~.~.~.~.~.~.~> Halogen bonded directly to the 5-position of the diazine ring (e.g., 5-fluorouridine, etc.)

DEFINITION

Classification: 536/28.53

Chalcogen bonded directly to the 2- and 4-positions of the diazine ring (e.g., uridine, etc.):

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

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