\ First attempt to describe d2 receptor in Aladdin language.
\ YCM and JVD 06/25/87.  Based on actives/inactives of Seeman.

DEFINE $POKN	[N;H2]CC
DEFINE $SOKN	[N;H](AA)CC
DEFINE $TOKN	[N;H0](AA)(AA)CC
DEFINE $OKN	[$TOKN,$SOKN,$POKN]
DEFINE $ENEG	[O,N,S;H]
DEFINE $VARI	[$ENEG]

\ OBJECTS:

POINT H-[$ENEG]		\O1.  H ON CATECHOL
POINT [$OKN]		\O2.  BASIC AMINE
PLANE OF MOLECULE	\O3.  LEAST SQUARES PLANE
POINT (3) (1,10.7)  (2,7.0)	\O4.  DUMMY ATOM

\ CONSTRAINTS:

DISTANCE(1,2)  6.8, 8.3		\C1.  AMINE-CATECHOL DISTANCE
DISTANCE(3,*)  4.0, 999.0	\C2.  FORBIDDEN REGION

\ GCL:

IF 1- [$ENEG]
  { IF 1- [$OKN]
    { CALL "SCORE" "ALL" "1 2" }