code: public static <C extends Compound> int indexOf(Sequence<C> sequence,
  			C compound) {
  		int index = 1;
  		for (C currentCompound : sequence) {
  			if (currentCompound.equals(compound)) {
  				return index;
  			}
  			index++;
  		}
  		return 0;
  	}
docs: Performs a linear search of the given Sequence for the given compound.
  Once we find the compound we return the position.