US PATENT SUBCLASS 552 / 515
.~.~ Nitrogen bonded directly 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.~.~ Nitrogen bonded directly to the cyclopentanohydrophenanthrene ring system {3}
516  DF  .~.~.~> The nitrogen is double bonded to the cyclopentanohydrophenanthrene ring system {3}
521  DF  .~.~.~> The nitrogen is bonded directly at the 3-position
522  DF  .~.~.~> The nitrogen is bonded directly at the 17-position

DEFINITION

Classification: 552/515

(under subclass 502) Compounds in which nitrogen is bonded directly to the cyclopentanohydrophenanthrene ring system.

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