• Checker searches for bonds NOT matching the following rules:

  Triple bond angle 180° (± 0.5 rad):	check_angle1
  Double bond angle 120° or 180° (± 0.5 rad):	check_angle2
  sp2 atom's bond angles 120°:	check_angle3
  sp3 atom's bond angles 90° or 3 bond angles 120°, 4th bond of an angle of n times 15°; or a bond angle of 120° and two adjacent angles equal:	check_angle4

• Fixer offers cleaning the structure by:

  1. 2D clean or (clean);

  2. partial clean (partialclean).

Example :

Note : The current version of bond angle checker examines chain bonds of 2D molecules. Envelope-shaped cyclic compounds are considered as error. Partial clean is not available.