US PATENT SUBCLASS 552 / 516
.~.~.~ The nitrogen is double bonded to the cyclopentanohydrophenanthrene ring system

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}
515  DF  .~.~ Nitrogen bonded directly to the cyclopentanohydrophenanthrene ring system {3}
516.~.~.~ The nitrogen is double bonded to the cyclopentanohydrophenanthrene ring system {3}
517  DF  .~.~.~.~> The nitrogen is part of a semicarbazone or thiosemicarbazone group
518  DF  .~.~.~.~> Additional nitrogen bonded directly to the nitrogen (e.g., hydrazones, etc.)
519  DF  .~.~.~.~> Oxygen bonded directly to the nitrogen (e.g., oximes, isonitrosos, etc.) {1}

DEFINITION

Classification: 552/516

(under subclass 515) Compounds in which the nitrogen is double bonded to the cyclopentanohydrophenanthrene ring system.

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