US PATENT SUBCLASS 540 / 48
.~.~.~.~ Hetero ring is one of the cyclos of the polycyclo ring system


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540 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
2  DF  .~.~ Cyclopentanohydrophenanthrene ring system containing {10}
47  DF  .~.~.~ The cyclopentanohydrophenanthrene ring system is part of a polycyclo ring system having at least five cyclos {1}
48.~.~.~.~ Hetero ring is one of the cyclos of the polycyclo ring system {8}
49  DF  .~.~.~.~.~> The hetero ring contains nitrogen {3}
59  DF  .~.~.~.~.~> The hetero ring contains sulfur
60  DF  .~.~.~.~.~> The hetero ring is a cyclic anhydride (i.e., containing -C(=X)-O-C(=Y)- as part of the ring, wherein X and Y are chalcogen; e.g., 5,8-maleic anhydride adduct of 5,7,9(11)-pregnatrien-3,20-di-one, etc.)
61  DF  .~.~.~.~.~> The hetero ring contains plural oxygens {2}
72  DF  .~.~.~.~.~> The hetero ring is a lactone (i.e., containing -C(=X)-O- as part of the ring, wherein X is chalcogen) {2}
76  DF  .~.~.~.~.~> The hetero ring is three-membered consisting of one oxygen and two carbons (e.g., oxirane, etc.) {9}
90  DF  .~.~.~.~.~> The hetero ring shares at least three ring members with one other cyclo of the polycyclo ring system (i.e., bridged) {2}
93  DF  .~.~.~.~.~> The hetero ring shares a ring carbon with two other cyclos of the polycyclo ring system (e.g., peri-fused, etc.)


DEFINITION

Classification: 540/48

(under subclass 47) Compounds wherein a hetero ring is one of the cyclos of the polycyclo ring system.

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