US PATENT SUBCLASS 568 / 370
.~.~.~.~.~.~ The tetracyclo ring system consists of two five-membered and two six membered cyclos (e.g., B-nor-testosterone, etc.)

Current as of: June, 1999
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568 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {4}
300  DF  .~ OXYGEN CONTAINING (E.G., PERCHLORYLBENZENE, ETC.) {11}
303  DF  .~.~ Ketones {10}
367  DF  .~.~.~ Plural alicyclic rings containing {1}
368  DF  .~.~.~.~ Polycyclo ring system {3}
369  DF  .~.~.~.~.~ Tetracyclo ring system (e.g., homo steroids, etc.) {2}
370.~.~.~.~.~.~ The tetracyclo ring system consists of two five-membered and two six membered cyclos (e.g., B-nor-testosterone, etc.) {1}
371  DF  .~.~.~.~.~.~.~> The six-membered rings are fused to each other (e.g., A-nor-progesterone, etc.)

DEFINITION

Classification: 568/370

(under subclass 369) Compounds wherein the tetracyclo ring system consists of two five-membered cyclos and two six-membered cyclos.

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