US PATENT SUBCLASS 548 / 312.1
.~.~.~.~.~.~ The additional polycyclo ring system is a bicyclo ring system having nitrogen as the only ring hetero atom [e.g., 5-(indolyl-3-methylene)- hydantoin, etc.]

Current as of: June, 1999
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548 /   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) {4}
100  DF  .~.~ Hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazoles, etc.) {18}
300.1  DF  .~.~.~ 1,3-diazoles (including hydrogenated) {9}
311.1  DF  .~.~.~.~ Additional hetero ring attached directly or indirectly to the diazole ring by nonionic bonding (e.g., 1,3-dioxolan-2-yl methyl-imidazole, etc.) {5}
311.4  DF  .~.~.~.~.~ The additional hetero ring is a cyclo in a polycyclo ring system [e.g., 2-(1-isothiochromanyl)-2-imidazoline hydrochloride, etc.] {2}
312.1.~.~.~.~.~.~ The additional polycyclo ring system is a bicyclo ring system having nitrogen as the only ring hetero atom [e.g., 5-(indolyl-3-methylene)- hydantoin, etc.]

DEFINITION

Classification: 548/312.1

(under subclass 311.4) Compounds wherein the additional polycyclo ring system contains nitrogen as the only ring hetero atom and consists of exactly two cyclos.

(1) Note. This subclass contains, for example: [figure]