US PATENT SUBCLASS 540 / 462
.~.~.~.~.~ Oxirane ring is one of the cyclos in the polycyclo ring system (e.g., maytansinol, etc.)

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540 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
450  DF  .~.~ The hetero ring contains at least eight members including nitrogen and carbon {9}
451  DF  .~.~.~ Chalcogen double bonded directly to a ring carbon of the hetero ring which is adjacent to the ring nitrogen (e.g., laurolactam, etc.) {7}
461  DF  .~.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos {1}
462.~.~.~.~.~ Oxirane ring is one of the cyclos in the polycyclo ring system (e.g., maytansinol, etc.)

DEFINITION

Classification: 540/462

(under subclass 461) Compounds wherein one of the cyclos of the polycyclo ring system is three-membered consisting of one oxygen and two carbons.

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