US PATENT SUBCLASS 552 / 531
.~.~.~.~ Nitrogen or sulfur containing


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}
531.~.~.~.~ Nitrogen or sulfur containing


DEFINITION

Classification: 552/531

(under subclass 530) Compounds which contain nitrogen or sulfur.