US PATENT SUBCLASS 544 / 271
.~.~.~.~.~.~.~.~.~.~.~.~.~ Having -C(=X)-, wherein X is chalcogen attached **directly or indirectly to the purine ring system by **nonionic bonding or halogen bonded directly at **8-position (e.g., theophylline acetate, **8-chlorotheophylline, etc.)


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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}
224  DF  .~.~.~ The six-membered hetero ring consists of two nitrogens and four carbons (e.g., 1,2-diazines, etc.) {9}
242  DF  .~.~.~.~ 1,3-diazines {10}
245  DF  .~.~.~.~.~ Polycyclo ring system having the diazine ring as one of the cyclos {3}
253  DF  .~.~.~.~.~.~ Bicyclo ring system having the diazine ring as one of the cyclos {5}
255  DF  .~.~.~.~.~.~.~ Four ring hetero atoms in the bicyclo ring system {1}
256  DF  .~.~.~.~.~.~.~.~ Four ring nitrogens in the bicyclo ring system {2}
262  DF  .~.~.~.~.~.~.~.~.~ The other cyclo in the bicyclo ring system is five-membered {2}
264  DF  .~.~.~.~.~.~.~.~.~.~ Purines (including hydrogenated) {2}
265  DF  .~.~.~.~.~.~.~.~.~.~.~ Chalcogen bonded directly to ring carbon of the purine ring system {3}
267  DF  .~.~.~.~.~.~.~.~.~.~.~.~ At 2- and 6-positions (e.g., theophyllines, etc.) {6}
271.~.~.~.~.~.~.~.~.~.~.~.~.~ Having -C(=X)-, wherein X is chalcogen attached **directly or indirectly to the purine ring system by **nonionic bonding or halogen bonded directly at **8-position (e.g., theophylline acetate, **8-chlorotheophylline, etc.)


DEFINITION

Classification: 544/271

Having -C(=X)-, wherein X is chalcogen, attached directly or indirectly to the purine ring system by nonionic bonding or halogen bonded directly at 8-position (e.g., theophylline acetate, 8-chlorotheophylline, etc.):

(under subclass 267) Compounds wherein either a group, in which X is chalcogen (i.e., oxygen, sulfur, selenium, or tellurium), is attached directly or indirectly to the purine ring system by nonionic bonding, or a halogen is bonded directly to the 8-position of the purine ring system.

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