code: public static boolean hasDeuteratedEquiv(Atom atom, Group currentGroup) {
  		if(atom.getElement()==Element.H && currentGroup.hasAtom(replaceFirstChar(atom.getName(),'H', 'D'))) {
  			// If it's hydrogen and has a deuterated brother
  			return true;
  		}
  		return false;
  	}
docs: Check to see if a Hydrogen has a  Deuterated brother in the group.
  @param atom the input atom that is putatively hydorgen
  @param currentGroup the group the atom is in
  @return true if the atom is hydrogen and it's Deuterium equiv exists.