US PATENT SUBCLASS 540 / 74
.~.~.~.~.~.~.~ The lactone ring shares the 11,12,13-positions of the cyclopentanohydrophenanthrene ring system (e.g., 11, 18-lactones, etc.)

Current as of: June, 1999
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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  DF  .~.~.~.~ Hetero ring is one of the cyclos of the polycyclo ring system {8}
72  DF  .~.~.~.~.~ The hetero ring is a lactone (i.e., containing -C(=X)-O- as part of the ring, wherein X is chalcogen) {2}
73  DF  .~.~.~.~.~.~ The lactone ring shares at least three ring members with one other cyclo of the polycylo ring system (i.e., bridged) {1}
74.~.~.~.~.~.~.~ The lactone ring shares the 11,12,13-positions of the cyclopentanohydrophenanthrene ring system (e.g., 11, 18-lactones, etc.)

DEFINITION

Classification: 540/74

(under subclass 73) Compounds wherein the lactone ring shares the 11, 12, 13-positions of the cyclopentanohydrophenanthrene ring system (i.e., C ring bridge).

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