US PATENT SUBCLASS 549 / 44
.~.~.~.~.~.~ Chalcogen attached directly to the tricyclo ring system by nonionic bonding

Current as of: June, 1999
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549 /   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) {2}
1  DF  .~.~ Sulfur containing hetero ring (e.g., thiiranes, etc.) {9}
29  DF  .~.~.~ The hetero ring is five-membered {13}
41  DF  .~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclos {3}
43  DF  .~.~.~.~.~ Tricyclo ring system having the hetero ring as one of the cyclos {1}
44.~.~.~.~.~.~ Chalcogen attached directly to the tricyclo ring system by nonionic bonding {2}
45  DF  .~.~.~.~.~.~.~> Chalcogen attached directly to the hetero ring by nonionic bonding {2}
48  DF  .~.~.~.~.~.~.~> Nitrogen attached directly or indirectly to the tricyclo ring system by nonionic bonding

DEFINITION

Classification: 549/44

(under subclass 43) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is attached directly to the tricyclo ring system by nonionic bonding.

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