US PATENT SUBCLASS 552 / 507
.~.~.~ The phosphorus is bonded directly at the 21-position or is bonded directly to a chalcogen which is bonded directly at the 21-positon

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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}
506  DF  .~.~ Phosphorus attached directly or indirectly to the cyclopentanohydrophenanthrene ring system by nonionic bonding {1}
507.~.~.~ The phosphorus is bonded directly at the 21-position or is bonded directly to a chalcogen which is bonded directly at the 21-positon

DEFINITION

Classification: 552/507

(under subclass 506) Compounds wherein the phosphorus is bonded directly to the carbon at the 21-position of the acyclic carbon chain that is bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system or is bonded directly to a chalcogen which is bonded directly at the 21-position of the acyclic carbon chain that is bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system.

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

[figure]