US PATENT SUBCLASS 987 / 352
.~ Ring contains three nitrogen atoms (9/65C)

Current as of: June, 1999
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987 /   HD   ORGANIC COMPOUNDS CONTAINING A Bi, Sb, As, OR P ATOM OR CONTAINING A METAL ATOM OF THE 6TH TO 8TH GROUP OF THE PERIODIC SYSTEM

350  DF  PHOSPHORUS CONTAINING AT LEAST ONE NITROGEN ATOM AS SOLE HETERO ATOM (9/65) {4}
352.~ Ring contains three nitrogen atoms (9/65C) {2}
353  DF  .~.~> Six-membered ring contains the three N atoms (9/65C6; 9/65C6E; 9/65C6G; 9/65C6K; 9/65C6Q; 9/65C6R; 9/65C6V)
354  DF  .~.~> Five-membered ring contains the three N atoms (9/65C5; 9/65C5E; 9/65C5G; 9/65C5K; 9/65C5R; 9/65C5V)

DEFINITION

Classification: 987/352

Ring contains three nitrogen atoms (9/65C):

(under subclass 350) Subject matter wherein the ring contains three nitrogen atoms.