US PATENT SUBCLASS 552 / 532
.~.~.~.~ The carbon is a member of an acyclic chain of exactly two carbons (e.g., 3 keto-4,17(20)-pregnadienes, 17-ethylidene-estranes,etc.)

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

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
502  DF  .~ Cyclopentanohydrophenanthrene ring system containing {21}
526  DF  .~.~ Carbon double bonded directly to the cyclopentanohydrophenantrene ring system {3}
530  DF  .~.~.~ The carbon is double bonded directly at the 17-position (e.g., fusidic acids, etc.) {2}
532.~.~.~.~ The carbon is a member of an acyclic chain of exactly two carbons (e.g., 3 keto-4,17(20)-pregnadienes, 17-ethylidene-estranes,etc.) {1}
533  DF  .~.~.~.~.~> Plural oxygens bonded directly to the cyclopentanohydrophenanthrene ring system {1}

DEFINITION

Classification: 552/532

(under subclass 530) Compounds wherein the carbon bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of exactly two carbons.

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