code: @Override
      public void removeChemSequence(int pos) {
          chemSequences[pos].removeListener(this);
          for (int i = pos; i < chemSequenceCount - 1; i++) {
              chemSequences[i] = chemSequences[i + 1];
          }
          chemSequences[chemSequenceCount - 1] = null;
          chemSequenceCount--;
          notifyChanged();
      }
docs: Removes a ChemSequence from this container.
  
  @param  pos  The position from which to remove
  @see   #chemSequences
  @see #addChemSequence(org.openscience.cdk.interfaces.IChemSequence)