US PATENT SUBCLASS 435 / 53
.~.~ Containing heterocyclic ring

Current as of: June, 1999
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435 /   HD   CHEMISTRY: MOLECULAR BIOLOGY AND MICROBIOLOGY

41  DF  MICRO-ORGANISM, TISSUE CELL CULTURE OR ENZYME USING PROCESS TO SYNTHESIZE A DESIRED CHEMICAL COMPOUND OR COMPOSITION {26}
52  DF  .~ Preparing compound containing a cyclopentanohydrophenanthrene nucleus; nor-, homo-, or D-ring lactone derivatives thereof {4}
53.~.~ Containing heterocyclic ring

DEFINITION

Classification: 435/53

Containing heterocyclic ring:

(under subclass 52) Processes wherein the cyclopentanophenanthrene ring system synthesized contains an additional ring which is a hetero ring.

(1) Note. The hetero ring may be fused or bridged with the cyclopentanophenanthrene ring system.