US PATENT SUBCLASS 552 / 521
.~.~.~ The nitrogen is bonded directly at the 3-position

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}
521.~.~.~ The nitrogen is bonded directly at the 3-position

DEFINITION

Classification: 552/521

(under subclass 515) Compounds wherein the nitrogen is bonded directly at the 3-position of the cyclopenthanohydrophenanthrene ring system.